And Trivalent Metal Oxide Patents (Class 501/139)
-
Patent number: 4855266Abstract: A dielectric composition is claimed consisting essentially of a donor- and acceptor-doped BaTiO.sub.3 having an intergranular phase of flux containing both glass-forming and glass-modifying ions. that can be co-fired in a low oxygen-containing atmosphere for the manufacture of multilayer capacitors having copper internal electrodes.Type: GrantFiled: February 18, 1988Date of Patent: August 8, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ian Burn
-
Patent number: 4845062Abstract: A composition for the preparation of low-firing dielectric layers comprising an admixture of finely divided particles of:(a) MgTiO.sub.3 ;(b) 0-10% wt., basis total solids, CaTiO.sub.3 ;(c) 5-10% wt., basis total solids, zinc borate frit in which the atomic ratio of zinc to boron is 1-3, the frit containing 0-5% wt., basis total solids, BaO, and in which up to 50 mol % of the B.sub.2 O.sub.3 is replaced by Al.sub.2 O.sub.3 ;(d) 0-5% wt., basis total solids, of a barium compound selected from BaCO.sub.3, BaTiO.sub.3 and mixtures thereof; and(e) an amount of a divalent metal oxide or precursor thereof selected from MgO, CaO, ZnO and mixtures thereof in an amount approximately molarly equivalent to the amount of BaTiO.sub.3 in the composition, the total amount of Ba in the composition, calculated as BaO, being 1-5% wt. of the total solids, the solids being free of Pb-, Bi- and Cd-containing compounds.Type: GrantFiled: October 19, 1987Date of Patent: July 4, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ian Burn
-
Patent number: 4843046Abstract: Disclosed herein is a ceramic composition of high dielectric constant which comprises the major constituents of PbO, La.sub.2 O.sub.3, MO, ZrO.sub.2, and TiO.sub.2 in the ratio defined by the formula below.(1-x-y)PbO.multidot.x/2La.sub.2 O.sub.3 .multidot.yMo.multidot.(1-z)ZrO.sub.2 .multidot.zTiO.sub.2where,M represents Ba and/or Sr;0.06.ltoreq.x.ltoreq.0.300.03.ltoreq.y.ltoreq.0.480.20.ltoreq.z.ltoreq.0.50and an additive represented by PbWo.sub.4 and/or Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3 in an amount of 1-40 wt % (in total) based on the above-mentioned major constituents (provided that the amount of PbWO.sub.4 is less than 15 wt % of the amount of the major constituents and the amount of Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3 is less than 40 wt % of the amount of the major constituents). Less than 5 mol % of all Pb in the composition may be replaced by Ag and/or less than 6 mol % of all Pb in the composition may be replaced by Bi.Type: GrantFiled: August 4, 1987Date of Patent: June 27, 1989Assignee: Mitsubishi Mining and Cement Co., Ltd.Inventors: Takashi Yamaguchi, Takeshi Inoue, Masashi Saito
-
Patent number: 4834052Abstract: Anti-reducing semiconducting porcelain having a positive temperature coefficient of resistance comprises a barium titanate composition, and a flux containing 0.14 to 2.88 parts by weight of TiO.sub.2 0.1 to 1.6 parts by weight of Al.sub.2 O.sub.3 and 0.1 to 1.6 parts by weight of SiO.sub.2 per 100 parts by weight of the barium titanate composition. It has a high positive temperature coefficient of resistance which does not show any appreciable change in the presence of a reducing atmosphere, such as hydrogen gas or gasified gasoline. It need not be isolated from a reducing atmosphere by a plastic or metallic enclosure, but can be exposed thereto. The flux may further contain a zinc, potassium or lithium compound.Type: GrantFiled: September 8, 1987Date of Patent: May 30, 1989Assignee: Nippondenso Co., Ltd.Inventors: Makoto Hori, Hitoshi Niwa, Hirokatsu Mukai, Toshiatsu Nagaya, Naoto Miwa, Itsuhei Ogata
-
Patent number: 4832939Abstract: The present invention involves a method for producing a variety of barium titanate based powder products consisting of submicron, dispersible primary particles having narrow size distributions. The method, in its broadest aspects, involves heating an aqueous slurry of PbO, or Pb(OH).sub.2, and Ca(OH).sub.2 with a stoichiometric excess of the hydrous oxides of Ti(IV), Sn(IV), Zr(IV) and Hf(IV) to a temperature not exceeding 200.degree. C. Thereafter, the resulting slurry temperature is adjusted to between 50.degree. and 200.degree. C. and a solution of Ba(OH).sub.2 and Sr(OH).sub.2, having a temperature of 70.degree. to 100.degree. C. is added within a period of five minutes or less to the slurry. About 10 minutes after the addition of the Ba(OH).sub.2 and Sr(OH).sub.2 solution is completed, the slurry is heated to a temperature not exceeding 225.degree. C. to ensure formation of a stoichiometric perovskite product. Thereafter, the slurry is cooled and the solid product is recovered.Type: GrantFiled: February 1, 1988Date of Patent: May 23, 1989Assignee: Cabot CorporationInventors: Jameel Menashi, Robert C. Reid, Laurence P. Wagner
-
Patent number: 4829033Abstract: Barium titanate based dielectric compositions having the general formula Ba.sub.(1-x-x'-x") Pb.sub.x Ca.sub.x' Sr.sub.x" Ti .sub.(1-y-y'-y") Sn.sub.y Zr.sub.y' Hf.sub.y" O.sub.3, wherein x, x', x" and y, y', y" represent mole fractions of the divalent and tetravalent cations and x and x' have independent value greater than 0.01 and less than 0.3 and x", y, y' and y" have independent values greater than zero and less than 0.3, such that the sum (x+x'+x") is greater than 0.01 and less than 0.4 and the sum (y+y'+y") does not exceed 0.4. Regardless of the specific composition selected, the products of the invention have a mean primary particle size in the range of 0.05 to 0.4 microns with a very narrow particle size distribution. The products are dispersible so that the mean particle size determined by image anaylsis and by sedimentation are comparable.Type: GrantFiled: February 1, 1988Date of Patent: May 9, 1989Assignee: Cabot CorporationInventors: Jameel Menashi, Robert C. Reid, Laurence Wagner
-
Patent number: 4824813Abstract: A dielectric ceramic composition consisting essentially of a BaO-TiO.sub.2 -WO.sub.3 ternary system wherein molar percentages of BaO, TiO.sub.2 and WO.sub.3 are within the range enclosed by a line joining the points of A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A of a composition diagram shown in the attached FIGURE, the range excluding molar percentages of BaO, TiO.sub.2 and WO.sub.3 laying on a line joining said points A, E and D. In the dielectric ceramic composition, up to 10 mole % of TiO.sub.2 may be replaced by tetravalent metal oxide and, further, MnO is contained in amounts of 3 mole % or less with respect to 100 mole % of the sum of BaO, TiO.sub.2 and WO.sub.3. Since the dielectric ceramic composition has a beneficial combination of dielectric properties, particularly a high Q, properly small dielectric constant and sufficiently small temperature coefficient of resonant frequency, .tau..sub.f, and .tau..sub.Type: GrantFiled: December 17, 1987Date of Patent: April 25, 1989Assignee: Narumi China CorporationInventors: Shinsuke Yano, Susumu Nishigaki, Hiroshi Kato, Toshio Nonomura
-
Patent number: 4812426Abstract: According to the invention a powder of lead-containing oxides and a process for preparing the same for the production of an element for electrical and other applications are provided. The powder is prepared by mixing and calcining a powder of oxides of metals other than lead, lead-containing oxides, metal substances forming the oxides upon calcination or mixtures thereof, adding and mixing a powder of a lead substance to obtain a mixture and then calcining the mixture. The powder includes a Perovskite type lead-containing oxides of the formula of ABO.sub.3 wherein A is a metal element coordinated with 12 oxygen atoms and containing at least lead, and B is a metal element coordinated with 6 oxygen atoms. A phase containing the lead forms a skin layer of the powder.Type: GrantFiled: February 6, 1987Date of Patent: March 14, 1989Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Touichi Takagi, Kohei Ametani, Kouichi Shimizu
-
Patent number: 4781859Abstract: A voltage-dependent non-linear resistance ceramic composition comprises SrTiO.sub.3, Sr.sub.1-x Ba.sub.x TiO.sub.3 (0.001.ltoreq.x.ltoreq.0.300) or Sr.sub.1-x Ca.sub.x TiO.sub.3 (0.001.ltoreq.x.ltoreq.0.300) as host material and further includes 0.001-2.000 mol % of Y.sub.2 O.sub.3 as metal oxide for semiconductorization acceleration, 0.001-3.000 mol % of metal oxide(s) of at least one selected from the group consisting of Ca.sub.2 O.sub.3, CuO, Ag.sub.2 O, Al.sub.2 O.sub.3, ZrO.sub.2, Bao, SiO.sub.2, MgO, B.sub.2 O.sub.3, MnO.sub.2, NiO, MoO.sub.3 BeO, Fe.sub.2 O.sub.3, Li.sub.2 O, Cr.sub.2 O.sub.3, PbO, CaO, TiO.sub.2, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3 and V.sub.2 O.sub.5, which segregates at grain boundary to make the grain boundary selectively to high resistances; an element made of the composition has both characteristics of capacitance and varistor, and is suitable for filter to remove noise or surge.Type: GrantFiled: November 14, 1986Date of Patent: November 1, 1988Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Keiichi Noi
-
Patent number: 4769354Abstract: A type I dielectric composition based on neodymium titanate is formed of a mixture comprising 58% to 78% by weight of neodymium titanate (Nd.sub.2 O.sub.3 -3TiO.sub.2), 10 to 21% by weight of lead titanate (PbTiO.sub.3), 5% to 14% by weight of barium titanate (BaTiO.sub.3), 4% to 15% by weight of barium zirconate (BaZrO.sub.3) and 0.2% to 1.2% by weight of yttrium oxide (Y.sub.2 O.sub.3).Type: GrantFiled: September 28, 1987Date of Patent: September 6, 1988Assignee: Compagnie Europeene de Composants Electroniques LCCInventors: Alain Beauger, Claude J. Schneider, Alain Rossello
-
Patent number: 4767732Abstract: To obtain a ceramic material having a high dielectric constant (K=2300 to 7000), a high insulation resistance (CR=4000 to 18000 ohmF), a low temperature dependence (.+-.10%) to (.+-.22, -33%) upon dielectric constant over a wide temperature range (-55 and +125.degree. C.) and a relatively low sintering temperature (1000.degree. C. to 1250.degree. C.), BaTiO.sub.3 powder at least 50 wt % of which is 0.7 to 3 .mu.m in particle size) is mixed with another compound with perovskite structure mainly composed of oxides of Pb, Ba, Sr, Zn, Nb, Mg and Ti before sintering. Further, part of Ti of BaTiO.sub.3 is substitutable with Zr or Sn, and part of Ba of BaTiO.sub.3 is substitutable with Sr, Ca or Ce.Type: GrantFiled: August 28, 1987Date of Patent: August 30, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Osamu Furukawa, Seiichi Yoshida, Motomasa Imai, Mitsuo Harata
-
Patent number: 4764494Abstract: A dielectric ceramic composition comprising 87.5 to 99.6 mole % of barium titanate as a first component, 0.2 to 7.0 mole % of copper oxide as a second component, 0.2 to 5.5 mole % of at least one member selected from the group consisting of lithium oxide, zinc oxide, cadmium oxide and iron oxide as a third component, and if necessary, at least one complex oxide selected from the group consisting of lead titanate, strontium titanate, calcium titanate, magnesium titanate, barium zirconate, calcium zirconate, strontium zirconate, lead zirconate, magnesium zirconate, lead stannate, calcium stannate, strontium stannate, barium stannate and magnesium stannate, as a fourth component in an amount of 0.3 to 40.0 moles per 100 moles of the sum of the first, second and third components; and a process for producing said dielectric ceramic composition.Type: GrantFiled: June 11, 1987Date of Patent: August 16, 1988Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Ken-ichi Sakabe, Shingo Kimura, Kageyasu Akashi
-
Patent number: 4757037Abstract: A fine powder of neodymium titanate or barium neodymium titanate, a process for its preparation and applications in ceramic compositions. A suspension of particles is formed by mixing a solution of neodymium nitrate or a solution of barium and neodymium nitrates with a sol of titania having a pH of from about 0.8 to 2.5 which contains elementary crystallites of TiO.sub.2 having a size of from about 10 to about 100 .ANG. in diameter which are agglomerated into submicron masses of from about 200 to about 1,000 .ANG. in diameter. The suspension obtained is dried, and the dried product is calcined at a temperature between 800.degree. C. and 1,300.degree. C., preferably for about 1 to 24 hours. If necessary, the powder obtained is milled. The fine powder obtained has a low fritting temperature and its density after heating for 2 hours at 1,300.degree. C. is greater than or equal to 95% of the theoretical density of the desired titanate powder.Type: GrantFiled: March 3, 1986Date of Patent: July 12, 1988Assignee: Rhone-Poulenc Specialities ChimiquesInventors: Jean-Francois Colombet, Claude Magnier
-
Patent number: 4755493Abstract: A ceramic composition for dielectric ceramic bodies, having a major component consisting of a compound having a perovskite structure or a complex perovskite structure. The ceramic composition includes at least one inorganic peroxide selected from the group consisting of calcium peroxide, strontium peroxide and barium peroxide.Type: GrantFiled: October 6, 1986Date of Patent: July 5, 1988Assignee: NGK Insulators, Ltd.Inventors: Yukihisa Takeuchi, Hideo Masumori
-
Patent number: 4753906Abstract: A dielectric ceramic composition for microwave applications having the formula ##EQU1## wherein x, y and z are molar percentages and 10.ltoreq.x.ltoreq.22, 58.ltoreq.y.ltoreq.80 and 8.ltoreq.z.ltoreq.22, O<n.ltoreq.25, and x+y+z=100;M is at least one selected from the group consisting of Sr, Ca and Mg; andR is at least one selected from the group consisting of Nd, Sm and La.The dielectric ceramic composition may further contain at least one oxide selected from the group consisting of Cr.sub.2 O.sub.3, Fe.sub.2 O.sub.3, WO.sub.3, SnO.sub.2 and ZrO.sub.2 in the range of more than zero to 5 mole percent based on the total molar percentage of x, y and z and have a superior combination of properties, particularly a high dielectric constant, a large Q and a small .tau.f which adapt them especially to use at the microwave region (wherein Q is the reciprocal of dielectric loss tan .delta., i.e., Q=1/tan .delta.).Type: GrantFiled: October 29, 1986Date of Patent: June 28, 1988Assignees: Narumi China Corporation, Sony CorporationInventors: Susumu Nishigaki, Shinsuke Yano, Hiroshi Kato, Tohru Fuwa, Kanji Murano
-
Patent number: 4751209Abstract: Dielectric ceramic composition consisting essentially of substance selected from those represented by the following formulas:(1) Pb.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a(2) Pb.sub.a Ca.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b(3) Pb.sub.a Ba.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b(4) Pb.sub.a Sr.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+bwherein x+y+z=1.00, and a or a+b.gtoreq.1.001.These compositions can be sintered below 1080.degree. C. in low partial pressure of oxygen of about 1.times.10.sup.-8, and exhibit a high dielectric constant and a high electrical resistivity.Type: GrantFiled: October 10, 1986Date of Patent: June 14, 1988Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoichirou Yokotani, Junichi Kato, Hiromu Ouchi
-
Patent number: 4749669Abstract: A dielectric ceramic composition comprising a ternary system composition represented by the formula, aBaO.bTiO.sub.2.cWO.sub.3 (wherein a, b and c are percent molar fractions totaling 100, i.e., a+b+c=100; 17.ltoreq.a.ltoreq.21.5; 75.ltoreq.b.ltoreq.83 and 0.1.ltoreq.c.ltoreq.5) and characterized by an advantageous properties, particularly, high dielectric constant, large Q and small .tau.f. In the compositions, TiO.sub.2 may be partially replaced by ZrO.sub.2 and, optionally, MnO may be also included up to 3 mole percent based on the total molar amount of the foregoing ingredients. The dielectric ceramic compositions are especially, but not exclusively, useful in microwave applications because of the foregoing advantages.Type: GrantFiled: May 7, 1986Date of Patent: June 7, 1988Assignee: Narumi China CorporationInventors: Susamu Nishigaki, Shinsuke Yano, Hiroshi Kato, Tohru Fuwa
-
Patent number: 4745093Abstract: Disclosed is a dielectric ceramic material having a chemical composition represented by the formula Sr(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 or (1-x)Sr(Ni.sub.1/3 Nb.sub.2/3)O.sub.3.xBaTiO.sub.3 in which x is a positive number of up to 0.3 and also having a perovskite structure. This dielectric material has a small dielectric loss and a large dielectric constant, and the temperature coefficient of the resonance frequency can be controlled to a small value within a certain range. The dielectric ceramic material is valuably used for microwave dielectric ceramics.Type: GrantFiled: November 26, 1985Date of Patent: May 17, 1988Assignee: Kyocera CorporationInventors: Takashi Okawa, Nobuo Yokoe
-
Patent number: 4736230Abstract: A composition for semiconductor porcelain comprisies:(a) 35.5 to 70 mol % of MgTiO.sub.3,(b) 26.5 to 61 mol % of BaTiO.sub.3,(c) a grain boundary improver, and(d) 0.01 to 0.2 mol % of an element selected from rare earth elements and the elements belonging to the group V of the periodic table.Type: GrantFiled: April 15, 1986Date of Patent: April 5, 1988Assignees: Canon Kabushiki Kaisha, Nippon Oil & Fats Co., Ltd.Inventors: Motoo Kumagai, Masato Nagano, Michiaki Sakaguchi
-
Patent number: 4724021Abstract: A method for inhibiting the formation of blisters during the firing of intermediate layers of fired multilayer electronic components comprising the sequential steps of:(1) applying to a substrate a first and second layer of finely divided particles of dielectric solids and glass dispersed in organic medium; and(2) firing the layers to effect volatilization of the organic medium therefrom, liquid phase sintering of the glass components and densification of both layers, the softening point of the glass, the particle size of the glass and the ratio of glass to dielectric solids in both layers being adjusted in such manner that when the layers are fired, the first layer is porous and the second layer is nonporous.Type: GrantFiled: July 23, 1986Date of Patent: February 9, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventors: Paul J. Martin, Thomas E. Dueber
-
Patent number: 4713726Abstract: A dielectric ceramic composition which comprises a mixture of 7 to 25 mole% of BaTiO.sub.3, 0.1 to 15 mole% of Bi.sub.2 O.sub.3, 50 to 65 mole% of TiO.sub.2, 0.1 to 5 mole% of LaO.sub.3/2 and 15 to 45 mole% of NdO.sub.3/2 in a total of 100 mole%. At least one member selected from the group consisting of Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3 and CeO.sub.2, and at least one member selected from the group consisting of Cr.sub.2 O.sub.3, MnO.sub.2, NiO and CoO are further added to the mixture in amounts of from 0.1 to 5 parts by weight and from 0.01 to 1 part by weight per 100 parts by weight of the mixture, respectively.Type: GrantFiled: July 24, 1986Date of Patent: December 15, 1987Assignee: Taiyo Yuden Kabushiki KaishaInventor: Kazuo Sasazawa
-
Patent number: 4699891Abstract: A dielectric ceramic composition for microwave applications comprises a mixture represented by the general formula:xBaO-yTiO.sub.2 -z{(Sm.sub.2 O.sub.3).sub.100-(w.sbsb.1.sub.+w.sbsb.2.sub.) (CeO.sub.2).sub.w.sbsb.1 (La.sub.2 O.sub.3).sub.w.sbsb.2 }wherein x, y, z, w.sub.1 and w.sub.2 are mole % of respective components, 6.ltoreq.x.ltoreq.22, 59.ltoreq.y.ltoreq.79.5, 2.ltoreq.z.ltoreq.34.5, x+y+z=100, and 0<(w.sub.1 +w.sub.2).ltoreq.95, and wherein both w.sub.1 and w.sub.2 are exclusive of zero.Further this composition may include MnO.sub.2 as another component of which the amount is 4 weight % and less on the basis of total weight of BaO, TiO.sub.2, Sm.sub.2 O.sub.3, CeO.sub.2 and La.sub.2 O.sub.3.Since this composition has a high specific dielectric constant .epsilon.r, a high no load value Q and a positive or negative temperature coefficient .eta.f of about zero, it can be used as a microwave dielectric resonator, a temperature compensating capacitor or the like.Type: GrantFiled: July 7, 1986Date of Patent: October 13, 1987Assignee: Oki Electric Industry Co., Ltd.Inventors: Hosaku Sato, Kazutoshi Ayusawa, Minoru Saito, Matsue Nakayama
-
Patent number: 4697222Abstract: A composition for dielectric porcelain comprises BaTiO.sub.3 and 1 to 5 mole % of a compound with a molar ratio of Bi.sub.2 O.sub.3 :RuO.sub.2 =1:2 based on said BaTiO.sub.3.Type: GrantFiled: April 9, 1986Date of Patent: September 29, 1987Assignee: Canon Kabushiki KaishaInventors: Norio Kaneko, Masahito Niibe
-
Patent number: 4673660Abstract: A circuit substrate according to the present invention comprises a sintered oxide body used as an insulating body, in which the sintered oxide body contains barium, tin, boron, titanium, silicon, and manganese in accordance with a converted equivalent composition of:______________________________________ BaO 10 to 55 mol %; SnO.sub.2 2 to 45 mol %; B.sub.2 O.sub.3 5 to 40 mol %; TiO.sub.2 0.1 to 25 mol %; SiO.sub.2 0.5 to 30 mol %; and MnO 0.5 to 7 mol %. ______________________________________An oxide with above composition can be fired at low temperatures on the order of 800.degree. to less than 1300.degree. C., and as a result it is possible to obtain a black circuit substrate that possesses properties of opacity to or absorption of light.Type: GrantFiled: June 26, 1986Date of Patent: June 16, 1987Assignee: Kabushiki Kaisha ToshibaInventor: Truong D. Thanh
-
Patent number: 4643984Abstract: A process for producing a composition which includes a perovskite compound, the process comprising:(a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium;(b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or(c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent tType: GrantFiled: July 23, 1985Date of Patent: February 17, 1987Assignee: Sakai Chemical Industry Co., Ltd.Inventors: Kazunobu Abe, Masashi Aoki, Hiroaki Rikimaru, Takeshi Ito, Kazuhisa Hidaka, Kayoko Segawa
-
Patent number: 4616289Abstract: This invention relates to ceramic high dielectric composition with BaTiO.sub.3 as host component; and by containing 1-5 weight part of CaTiO.sub.3 and 2-3 weight parts of Ta.sub.2 O.sub.5 to 100 weight parts of the BaTiO.sub.3, a composition having dielectric constant of 3000 or above, a small voltage dependency, a large bending strength and good high frequency characteristic is provided; and it has a good characteristic when used as thin film type dielectric body like laminated ceramic capacitor.Type: GrantFiled: June 19, 1985Date of Patent: October 7, 1986Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Gen Itakura, Tadayoshi Ushijima, Kenji Kusakabe, Takayuki Kuroda
-
Patent number: 4564602Abstract: A high permittivity ceramic composition comprises, by weight, 84.25 to 92.4% of substantially stoichiometric barium titanate; substantially stoichiometric calcium zirconate and substantially stoichiometric calcium stannate, the sum of said calcium zirconate and calcium stannate being 9.5 to 13.5%, the weight ratio of said calcium zirconate to calcium stannate being 1:2.5 to 3:1; 0.05 to 0.25% of substantially stoichiometric magnesium titanate; and 0.05 to 2.0% of at least one oxide of rare earth elements.Type: GrantFiled: September 28, 1984Date of Patent: January 14, 1986Assignee: Murata Manufacturing Co., Ltd.Inventors: Yasuyuki Nakazawa, Yoshiharu Kato
-
Patent number: 4558021Abstract: In a ceramic dielectric composition with BaTiO.sub.3 as host material, CaTiO.sub.3 and Sb.sub.2 O.sub.3 are added to be contained, and besides thereto any one of Nd.sub.2 O.sub.3, La.sub.2 O.sub.3 and Sm.sub.2 O.sub.3 are added to be included, thereby ceramic dielectric composition having high dielectric constant, small voltage dependency of characteristics, large bending force, and small equivalent series resistance in high frequency range is provided.Also, by having BaTiO.sub.3 as host material and adding CaTiO.sub.3 and Ta.sub.2 O.sub.5 thereto, and further adding Sb.sub.2 O.sub.3 or Pr.sub.6 O.sub.11, similar superior characteristics to the above-mentioned ceramic high dielectric composition is obtainable.Besides, by adding SiO.sub.2 to the above-mentioned ceramic high dielectric compositions, strength is further increased.These ceramic dielectric composition of high dielectric constant is suitable for, for example, dielectric substance of laminated ceramic capacitor.Type: GrantFiled: February 16, 1984Date of Patent: December 10, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takuoki Hata, Akira Ohmi, Tadayoshi Ushijima, Takayuki Kuroda
-
Patent number: 4550089Abstract: A microwave dielectric ceramic composition consisting of 15-19 mol % of barium oxide (BaO), 61-73 mol % of titanium dioxide (TiO.sub.2), 3.5-15 mol % of samarium oxide (Sm.sub.2 O.sub.3), and 1.5-15 mol % of cerium oxide (CeO.sub.2). Since this composition has a high specific dielectric constant .epsilon..sub.r and a high no load value Q, it can be used as a microwave resonator, a temperature compensating capacitor or the like.Type: GrantFiled: May 3, 1984Date of Patent: October 29, 1985Assignee: Oki Electric Industry Co., Ltd.Inventors: Kazutoshi Ayusawa, Hosaku Satoh, Munetada Kazama
-
Patent number: 4540676Abstract: A low temperature fired ceramic dielectric composition in which the dielectric constant does not vary from its base value of over 2400 by more than 15 percent over a wide temperature range. A base ceramic preparation (a) and a ceramic flux (b), each consisting essentially of metal oxides or precursors thereof to provide in oxide form (a) 98.0 to 99 weight percent barium titanate, from about 0.97 to about 1.54 weight percent niobium pentoxide and from about 0.19 to about 0.32 weight percent cobalt oxide; (b) from about 16 to about 60 weight percent bismuth titanate, about 8 to about 52 weight percent lead titanate, about 18 to about 35 weight percent zinc oxide and about 5 to about 11 weight percent boron oxide. Manganese dioxide or precursor thereof in amount of from about 0 to 0.Type: GrantFiled: May 23, 1984Date of Patent: September 10, 1985Assignee: TAM CeramicsInventors: Mike S. H. Chu, Charles E. Hodgkins, Daniel C. Rose
-
Patent number: 4537865Abstract: A process for preparing a particulate ceramic material comprising the steps of:(a) adding carbon dioxide or an aqueous solution of a soluble carbonate to first aqueous solution of a nitrate or chloride of Ba, Sr, Ca or Mg in a first vessel to adjust the pH of said first aqueous solution to between 7 and 10 thereby forming a carbonate precipitate;(b) adding an aqueous solution of a soluble hydroxide to a second aqueous solution of a nitrate or chloride of Ti, Zr, Sn or Pb in a second vessel to adjust the pH of said second aqueous solution to between 7 and 10 thereby forming a hydroxide precipitate;(c) combining slurries containing the precipitates formed in said first and second vessels;(d) mixing the combined slurries;(e) passing the slurries through a filter;(f) washing the filter cake with water;(g) drying the filter cake to form a powder;(h) calcining the dried powder; and(i) grinding the calcined powder.Type: GrantFiled: July 11, 1984Date of Patent: August 27, 1985Assignee: Murata Manufacturing Co., Ltd.Inventors: Shinsei Okabe, Hiroshi Komatsu, Yukio Hamaji, Shozo Kojima, Yoshiharu Kato
-
Patent number: 4535064Abstract: Ceramic compositions having (1) a mixture comprised of barium titanate, zirconium oxide and one or more of cerium oxide, neodymium oxide, lanthanum oxide and an oxide of at least one of lanthanides having atomic numbers 59 to 66 in specific ratios and (2) 0.01 to 0.4% by weight (calculated as Mn based on the weight of the mixture) manganese oxide. Such compositions form reduction-reoxidation type semiconducting capacitors of reduced size and increased capacitance per unit area.Type: GrantFiled: May 24, 1984Date of Patent: August 13, 1985Assignee: Murata Manufacturing Co., Ltd.Inventor: Yasunobu Yoneda
-
Patent number: 4525767Abstract: A dielectric composition, for use in the manufacture of ceramic capacitors, and comprised of barium titanate (BaTiO.sub.3) with small additions of niobium pentoxide (Nb.sub.2 O.sub.5) and gadolinium sesquioxide (Gd.sub.2 O.sub.3).Type: GrantFiled: June 11, 1984Date of Patent: June 25, 1985Assignee: Standard Telephones and Cables plcInventor: John H. Alexander
-
Patent number: 4522927Abstract: A dielectric ceramic composition having a composition represented by the formulaxBaO-yNd.sub.2 O.sub.3 -z(Ti.sub.1-m Zr.sub.m)O.sub.2wherein x+y+z=1.000<m.ltoreq.0.25and x, y, and z are in the molar ratio region surrounded by the points a, b, c, and d which are represented by the following x-y-z coordinates:______________________________________ x y z ______________________________________ a 0.15 0.12 0.73 b 0.15 0.18 0.67 c 0.05 0.18 0.77 d 0.05 0.12 0.Type: GrantFiled: October 26, 1983Date of Patent: June 11, 1985Assignees: Mitsubishi Mining, Cement Company Ltd.Inventors: Masao Kashima, Noboru Tomuro
-
Patent number: 4500942Abstract: Multilayer ceramic capacitors, and in particular NPO class capacitors are produced from dielectric compositions comprising a mixture of BaO, PbO, Nd.sub.2 O.sub.3, Bi.sub.2 O.sub.3, TiO.sub.2 and one of the rare earth oxides selected from the group consisting of Pr.sub.6 O.sub.11 and Sm.sub.2 O.sub.3, the selected rare earth oxide being present in an amount ranging from approximately 10 to 100 wt. % of the amount of Nd.sub.2 O.sub.3 in the mixture. In one embodiment an acrylic binder is added to the mixture to produce ceramic sheets which are screen printed with a Pt-Pd-Au electrode, and then cut into thin layers, stacked, laminated, sintered and terminated to produce a multilayer capacitor having an extremely stable TC and effective dielectric constant as high as 120.Type: GrantFiled: November 12, 1982Date of Patent: February 19, 1985Assignee: Ferro CorporationInventor: James M. Wilson
-
Patent number: 4485181Abstract: Dielectric ceramic composition containing by weight, 33% to 40% of PbTiO.sub.3 ; 6% to 35% of SrTiO.sub.3 ; 3% to 18% of CaTiO.sub.3 ; 0.5% to 10% of MgTiO.sub.3 ; 6% to 26% of Bi.sub.2 O.sub.3 ; 3% to 15% of TiO.sub.2 ; 0.2% to 4% of ZnO; 0.2% to 5% of Nb.sub.2 O.sub.5 ; 0.1% to 4% of CeO.sub.2 and 0.1% to 2% of Al.sub.2 O.sub.3.Type: GrantFiled: June 16, 1983Date of Patent: November 27, 1984Assignee: Murata Manufacturing Co., Ltd.Inventor: Yukio Sakabe
-
Patent number: 4483933Abstract: A semiconductor ceramic composition of a barium titanate system comprises a main component containing a minor quantity of one or more semiconductor-forming elements, and additives of manganese oxides and silica incorporated therein, and is characterized by that the main component consists essentially of 30 to 95 mol % of BaTiO.sub.3, 3 to 25 mol % of CaTiO.sub.3, 1 to 30 mol % of SrTiO.sub.3 and 1 to 50 mol % of PbTiO.sub.3. The contents of manganese oxides and silica are 0.03 to 0.15 mol %, preferably, 0.03 to 0.10 mol % in terms of Mn, and 0.5 to 5 mol % in terms of SiO.sub.2, respectively, with respect to one mole of the main component. One or more semiconductor-forming elements are selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and the content of the elements is 0.2 to 1.0 mol %.Type: GrantFiled: April 13, 1984Date of Patent: November 20, 1984Assignee: Murata Manufacturing Co., Ltd.Inventors: Takashi Kobayashi, Motoi Nishii
-
Patent number: 4477581Abstract: A high permittivity ceramic composition consisting essentially of a main component expressed by the general formula:(Ba.sub.1-x Me.sub.x) (Ti.sub.1-y Me'.sub.y)O.sub.3whereinMe is Ca and/or Sr, Me' is Zr and/or Sn, x and y are respective mole fractions of Me and Me', 0.06.ltoreq.x .ltoreq.0.14, and 0.06.ltoreq.y .ltoreq.0.14; anda secondary component consisting essentially of 65 to 90 mol % of PbTiO.sub.3, 1 to 10 mol % of Pb.sub.5 Ge.sub.3 O.sub.11 and 1 to 30 mol % of Bi.sub.2 Ti.sub.2 O.sub.7, the content of the secondary component being 5 to 15 weight percent of the amount of the main component.Type: GrantFiled: August 3, 1983Date of Patent: October 16, 1984Assignee: Murata Manufacturing Co., Ltd.Inventors: Goro Nishioka, Hiroshi Komatsu, Yukio Sakabe
-
Patent number: 4468472Abstract: A composition for ceramic dielectrics comprising BaO, CeO.sub.2, ZrO.sub.2, CaO and TiO.sub.2 in sintered state. The composition can also contain at least one of MnO.sub.2, Cr.sub.2 O.sub.3, FeO, NiO, and CoO as additive. As the composition is very fine in grain size, and has a prolonged life, it is very suitable for a raw material of such a product as a layer-built capacitor which is used in high electric field.Type: GrantFiled: December 13, 1982Date of Patent: August 28, 1984Assignee: Mitsubishi Mining & Cement Company, Ltd.Inventors: Masao Kashima, Yasuo Miyashita
-
Patent number: 4459364Abstract: A low-fired ceramic dielectric composition, a multilayer capacitor made from such a ceramic dielectric composition provided with silver/palladium electrodes having at least 65 atomic percent silver, and a method of manufacturing such a multilayer capacitor. The ceramic is barium titanate-based and includes Bi.sub.2 O.sub.3, Nb.sub.2 O.sub.5, and TiO.sub.2 to improve sinterability. MnCO.sub.3 is added to increase the insulation resistance. The multilayer capacitor includes high silver-content electrodes to reduce the quantity of expensive noble metals. The multilayer part may be fired at a temperature of 1150.degree. C. or less to yield a capacitor meeting EIA specification X7R. The low firing temperature also inhibits a chemical reaction between bismuth and palladium.Type: GrantFiled: September 13, 1982Date of Patent: July 10, 1984Assignee: North American Philips CorporationInventors: Robert T. McSweeney, Stanley A. Long
-
Patent number: 4447549Abstract: A D-E hysteresis loop of ferroelectrics known in the art has a square shape when the ferroelectrics are a BaTiO.sub.3 single crystal. Such ferroelectrics are used as a non-linear dielectric element of, for example a pulse generating device. The non-linear dielectric element according to the present invention consists of a polycrystal, which is mainly composed of BaTiO.sub.3 and has the chemical composition expressed by the formula A.sub.y B.sub.z O.sub.3, wherein the molar ratio of y/z ranges from 0.92 to 0.99. The non-linearity is excellent and the temperature dependence of the A.sub.y B.sub.z O.sub.3 composition is considerably low.Type: GrantFiled: March 22, 1983Date of Patent: May 8, 1984Assignee: TDK Kabushiki KaishaInventors: Sho Masujima, Masahide Shibuya, Iwaya Shoichi, Kenichi Umeda, Yasunobu Oikawa, Hisao Abe, Yoshifumi Midori, Shinobu Fujiwara, Nobuaki Kikuchi
-
Patent number: 4442220Abstract: A dielectric ceramic composition consisting essentially of a solid solution represented by the formula:xBaO-yTiO.sub.2 -z{(Sm.sub.2 O.sub.3).sub.1-(v+u) (Pr.sub.2 O.sub.11/3).sub.v (Nd.sub.2 O.sub.3).sub.u }wherein 0.05.ltoreq.x.ltoreq.0.23, 0.57.ltoreq.y.ltoreq.0.825, 0.025.ltoreq.Z.ltoreq.0.375, x+y+z=1, 0<v.ltoreq.0.95, 0.ltoreq.u<0.95 and 0<(v+u).ltoreq.0.95.The dielectric ceramics exhibits high dielectric constant and low microwave loss with high temperature stability in resonant frequency and is suitable for use as dielectric resonators, electrical filters and substrate.Type: GrantFiled: April 13, 1982Date of Patent: April 10, 1984Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromu Ouchi, Syunichiro Kawashima, Masamitsu Nishida, Ichiro Ueda
-
Patent number: 4404029Abstract: A D-E hysteresis loop of ferroelectrics known in the art has a square shape when the ferroelectrics are a BaTiO.sub.3 single crystal. Such ferroelectrics are used as a non-linear dielectric element of, for example a pulse generating device. The non-linear dielectric element according to the present invention consists of a polycrystal mainly composed of Ba(Ti.sub.0.90-0.98 Sn.sub.0.02-1.00)O.sub.3 and having an average grain diameter of from 10 to 60 .mu.m. The non-linearity is excellent and the temperature dependence of the non-linearity is considerably low.Type: GrantFiled: February 19, 1982Date of Patent: September 13, 1983Assignee: TDK Electronics Co., Ltd.Inventors: Shoichi Iwaya, Hitoshi Masumura, Yoshifumi Midori, Yasunobu Oikawa, Hisao Abe
-
Patent number: 4394456Abstract: A temperature-compensating ceramic dielectric mainly comprises a composition consisting essentially of 35 to 65 wt % of neodymium titanates (Nd.sub.2 Ti.sub.2 O.sub.7), 10 to 35 wt % of barium titanates (BaTiO.sub.3), 10 to 35 wt % of titanium oxide (TiO.sub.2), 1 to 6 wt % of bismuth oxide (Bi.sub.2 O.sub.3) and 1 to 10 wt % of lead oxide (Pb.sub.3 O.sub.4), and contains 1 to 6 wt % of zinc oxide (ZnO) and 1 to 6 wt % of silicon oxide (SiO.sub.2). Up to 50 atom % of neodymium in neodymium titanates (Nd.sub.2 Ti.sub.2 O.sub.7) may be replaced with at least one element of the other rare earth elements except for Nd.Type: GrantFiled: April 7, 1982Date of Patent: July 19, 1983Assignee: Murata Manufacturing Co., Ltd.Inventors: Yukio Sakabe, Goro Nishioka
-
Patent number: 4392180Abstract: Thick film dielectric compositions suitable for screen-printing comprising a substituted perovskite, an inorganic dopant, and a low temperature-devitrifiable frit or glass. Upon firing the dielectric composition is highly hermetic.Type: GrantFiled: April 29, 1982Date of Patent: July 5, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventor: Kumaran M. Nair
-
Patent number: 4386985Abstract: A ceramic dielectric based on the oxides of Ba, Ti, Ca, and Zr is doped with magnesium oxide and nickel oxide (or other base metal). The dielectric composition can be sintered with nickel (or other base metal) electrodes in a broad range of reducing atmospheres to provide capacitors with stable and uniformly good dielectric properties.Type: GrantFiled: June 18, 1981Date of Patent: June 7, 1983Assignee: North American Philips CorporationInventor: Roger T. Dirstine
-
Patent number: 4384989Abstract: Semiconductive barium titanate having a positive temperature coefficient of resistance comprises a barium titanate semiconductor including barium titanate and a small quantity of a doping element, and at least one additive selected from among silicon nitride, titanium nitride, zirconium nitride and silicon carbide. The semiconductive barium titanate of this invention has a sharp rise in the variation of specific resistivity with temperature change and a large specific resistivity ratio in the PTC temperature region, and can be produced with high reproducibility, since a widely differing quantity of the doping element can be effectively added to barium titanate.Type: GrantFiled: April 30, 1982Date of Patent: May 24, 1983Assignee: Kabushiki Kaisha Toyota Chuo KenyushoInventors: Osami Kamigaito, Tatsumi Hioki, Nobuyuki Yamamoto, Yoshiharu Hirose, Haruo Doi
-
Patent number: 4379854Abstract: A mixture of powders of barium titanate, a Curie point shifter and a lead titanate-bismuth titanate metal oxide flux which may be fired in a single step at 1800.degree. F. to 2100.degree. F. to produce a dense ceramic body with high dielectric constant. The ceramic is adapted to monolithic, multilayer ceramic capacitors. The low firing temperature minimizes the requirements of high temperature noble electrode material.Type: GrantFiled: February 6, 1981Date of Patent: April 12, 1983Assignee: Erie Technological Products, Inc.Inventor: Jakob C. K. Soong
-
Patent number: 4357426Abstract: A humidity sensitive ceramics comprises a sintered body consisting essentially of a semiconductive compound oxide with a perovskite structure and a compound oxide, said semiconductive compound oxide having a composition expressed by the general formula (I):A.sub.1-x A'.sub.x BO.sub.3-.delta.. . . (I)wherein A is at least one element selected from the group consisting of rare earth elements with atomic numbers 57 to 71, yttrium and hafnium, A' is at least one element selected from the group consisting of alkaline-earth metals, B is at least one element selected from the group consisting of transition elements with atomic numbers 23 to 30, x is a mole fraction and takes a value of the following range, 0.ltoreq.x.ltoreq.1, and .delta. is a non-stoichiometric parameter, said compound oxide having a composition expressed by the general formula (II):AMO.sub.3 . . .Type: GrantFiled: December 17, 1981Date of Patent: November 2, 1982Assignee: Murata Manufacturing Co., Ltd.Inventors: Michihiro Murata, Shinsei Okabe
-
Patent number: 4338403Abstract: A dielectric ceramic consisting essentially of at least 88 weight % of a main component and up to 12 weight % of stannic oxide (SnO.sub.2), said main component consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO.sub.2), 9 to 63 weight % of Praseodymium oxide (Pr.sub.6 O.sub.11) and 2.5 to 23.5 weight % of barium oxide (BaO), at most 95 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd.sub.2 O.sub.3).It exhibits large dielectric constant and low microwave loss with large temperature-stability for resonant frequency and it is suitable for use as dielectric resonators, electrical filters, substrates, etc.Type: GrantFiled: May 21, 1981Date of Patent: July 6, 1982Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Syunichiro Kawashima, Masamitsu Nishida, Ichiro Ueda, Hiromu Ouchi