Abstract: A piezoelectric ceramic composition is represented by [(Pb1-xXx)a{(Nib/3Nb2/3)cTidZr1-c-d}O3] in which X is at least one of Sr, Ba, Ca and La), and the compositional amounts x, a, b, c, and d respectively satisfy 0.001?x?0.1, 0.930?a?0.998, 1.02?b?1.40, 0.1?c?0.6 and 0.3?d?0.6. The specific surface area of the material powder before firing is preferably set to 5 m2/g or more. A piezoelectric ceramic body 1 is fabricated using the piezoelectric ceramic composition. In this manner, a sufficiently high piezoelectric constant can be obtained not only in the electric field range of 400 to 500 V/mm but also in an electric field range of 1 kV/mm or more. Furthermore, a piezoelectric ceramic composition that can be fired at a low-temperature and a piezoelectric ceramic electronic component using this composition can be provided.

Abstract: A nonreducing dielectric ceramic comprising a (Sr, Ca)(Ti, Zr)O3-based perovskite principal crystal phase containing 55 mole percent or more of SrTiO3 and whose powder CuK? X-ray diffraction pattern exhibits a ratio of less than 5% of the maximum peak intensity of the accessory crystal phases being the other crystal phases to the intensity of the maximum peak of the perovskite crystal phase, which is present at 2?=25° to 35°. This strontium titanate-based nonreducing dielectric ceramic has a high relative dielectric constant of 150 or more, a low third-order harmonic distortion ratio, and an excellent reliability in a high temperature-loading test. Accordingly, it is advantageously used for forming dielectric ceramic layers of a monolithic ceramic capacitor.

Abstract: Dielectric ceramics represented as: CaxZrO3+aMn+bLi+cB+dSi and comprising: based on 100 mol of CaxZrO3 (where 1.00?x?1.10), 0.5?a?4.0 mol, and 6.0?b+c+d?15.0 mol, in which 0.15?b/(c+d)?0.55, and 0.20?d/c?3.30 or multi-layer ceramic capacitor using the same.

Abstract: The invention intends to provide a single crystal material that can be used as a dielectric material for use in electronic devices, which has a high Qf value; and a process for producing the same. According to the invention, a single crystal of a composite oxide is obtained from a composition in which a slight amount of SrTiO3 is added to LaAlO3, and the (1-X)LaAlO3—XSrTiO3 single crystal material having the specific composition has such dielectric characteristics for electronic devices that the dielectric constant is 24 or more and the Qf value is 300,000 GHz or more, is considerably improved in the Qf value as a dielectric material, and can be applied to a high-temperature superconducting filter.

Abstract: Anisotropically shaped ceramic particles are represented by the general formula {(K1-x-yNaxLiy)4(Nb1-zTaz)6O17+aMeOb} (where Me is at least one element selected from the group consisting of antimony, copper, manganese, vanadium, silicon, titanium, and tungsten; and b is a positive number determined by the valence of Me), where x, y, z, and a satisfy 0?x?0.5, 0?y?0.3, 0?z?0.3, and 0.001?a?0.1, respectively. The anisotropically shaped ceramic particles have a plate-like shape. The average particle size is 1 to 100 ?m, and the ratio D/t of the maximum diameter D of a main surface to the thickness t in a direction perpendicular to the main surface is 2 or more, preferably 5 or more. Thus, anisotropically shaped ceramic particles suitable as a reactive template for preparing a crystal-oriented alkali metal niobate-based ceramic can be produced at relatively low production costs without the need for a complicated production process.

Abstract: A ceramic insulating material, in particular for sensor elements for determining the concentration of gas components in gas mixtures, is based on an alkaline earth-containing ceramic. The insulating material contains a hexaaluminate of the alkaline earth metal and at least one mixed compound of the alkaline earth metal with an acid oxide, the molar ratio of hexaaluminate to the sum of mixed compounds in the insulating material being 1.3 to 4.0.

Abstract: A glass ceramic composition is used for a multilayer ceramic substrate 2 including glass ceramic layers 3 laminated, the multilayer ceramic substrate 2 being used for a multilayer ceramic module 1. The glass ceramic composition includes a first ceramic powder mainly composed of forsterite, a second ceramic powder mainly composed of at least one component selected from CaTiO3, SrTiO3 and TiO2, and a borosilicate glass powder containing Li2O, MgO, B2O3, SiO2, ZnO and Al2O3. The glass ceramic composition contains 3 percent by weight or more of the borosilicate glass powder and further contains at least one additive selected from the group consisting of CaO, BaO and SrO.

Abstract: The present invention relates to a dielectric ceramic composition comprising a main component including at least one selected from barium titanate, strontium titanate and calcium titanate, and as a subcomponent, a glass component including an oxide of B, wherein a content of said glass component is 2 to 7 wt % with respect to 100 wt % of said main component. According to the present invention, there are provided a dielectric ceramic composition wherein a layer can be made thinner by relatively decreasing a content of the glass component, etc., as well as having good properties (specific permittivity, loss Q value and insulation resistance), and a complex electronic device such as a multilayer filter or a multilayer ceramic capacitor, which has a dielectric layer composed of the dielectric ceramic composition.

Abstract: A forsterite powder with superior characteristics which can be sintered at a relatively low temperature can be economically produced, when a magnesium source, a silicon source, and copper particles are mixed to prepare a mixed powder containing 300 to 2,000 ppm by weight of the copper particles, and the mixed powder is fired. The magnesium source used is preferably Mg(OH)2, and the silicon source used is preferably SiO2. A polycrystalline forsterite powder is preferably produced. The magnesium source, the silicon source, and the copper particles can be mixed in the presence of a solvent to prepare the mixed powder. The forsterite powder preferably contains 300 to 2,000 ppm by weight of copper, has a particle size of 0.20 to 0.40 ?m and has a crystal size of 0.034 to 0.040 ?m.

Abstract: A ceramic powder composition, ceramic material, and laminated ceramic condenser comprised thereof. The composition includes ceramic powders comprising (SrxCa1-x)TiyZr1-yO3, and a sintering aid, wherein x is between 0 and 1, and y is between 0 and 0.1. The sintering aid is Ma2O, MbO, Mc2O3, MdO2, or a combination thereof. Element Ma comprises Li, Na, K, or a combination thereof. Element Mb comprises Be, Mg, Ca, Sr, Ba, or a combination thereof. Element Mc comprises B, Al, Ga, or a combination thereof. Element Md comprises Si, Ge, or a combination thereof.

Abstract: There is provided bonding material having a Young's Modulus after hardening of not less than 20% of articles to be bonded, and an average linear coefficient of thermal expansion after hardening of not more than 70% of the articles to be bonded. This bonding material can suppress deformation of a honeycomb segment due to thermal stress to be generated by a bonding material layer and can suitably be used at the time of manufacturing exhaust gas trapping filters capable of reducing the generation of defects such as a crack, and above all, a diesel particulate filter (DPF) for trapping particulate matter (particulates) in exhaust gas from the diesel engine.

Abstract: A semiconductor ceramic has a mixing molar ratio m between the Sr site and the Ti site satisfying the relationship 1.000?m<1.020, a donor element in an amount of 0.8 to 2.0 moles relative to 100 moles of the Ti element dissolved in the Sr site to form a solid solution, the donor element having a higher valency than the Sr element, a transition metal element, such as Mn, incorporated in an amount of 0.3 to 1.0 mole relative to 100 moles of the Ti element so as to be segregated in grain boundaries, and an average grain size of crystal grains is 1.0 ?m or less.

Abstract: A production method of a dielectric ceramic composition at least including a main component including a dielectric oxide having perovskite-type crystal structure expressed by a formula ABO3 (note that in the formula, “A” indicates one or more elements selected from Ba, Ca, Sr and Mg, and that “B” indicates one or more elements selected from Ti, Zr and Hf) comprises steps of preparing a main component material including said dielectric oxide expressed by ABO3; preparing a subcomponent material including a composite oxide expressed by M4R6O(SiO4)6 (note that “M” indicates at least one selected from Ca and Sr, and that “R” indicates at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu); mixing said main component material and subcomponent material to obtain a dielectric ceramic composition material; and firing said dielectric ceramic composition material.

Abstract: The invention intends to provide a dielectric porcelain composition for use in electronic devices, which has the dielectric characteristics such that the Qf value is high, the temperature coefficient ?f of a resonant frequency is small and a value thereof can be controlled in a wide range in positive and negative directions in the vicinity where the relative dielectric constant ?r is 39. According to the invention, when, in La—Pr—Al—Ga—Sr—Ti-based oxide dielectric porcelain, contents of the respective elements are limited to be within particular ranges and Sr is partially substituted by Ca, a structure having a (1-x)(La1-yLny)(Al1-zGaz)O3-x(Sr1-mCam)TiO3 solid solution as a main phase, in which a solid solution of Al—Ga—Sr-based oxide and/or a solid solution of Al—Ga-based oxide and a Sr oxide is/are precipitated in a grain boundary thereof, can be obtained, whereby the above-mentioned object can be achieved.

Abstract: A glass ceramic composition for glass ceramic layers laminated in multilayer ceramic substrate included in multilayer ceramic module is provided. The glass ceramic composition contains a first ceramic powder mainly composed of forsterite, a second ceramic powder mainly composed of at least one material selected from CaTiO3, SrTiO3 and TiO2, and a borosilicate glass powder containing Li2O, MgO, B2O3, SiO2, ZnO and possibly Al2O3. The content of the borosilicate glass powder is about 3 percent by weight or more. The borosilicate glass powder further contains at least one additive selected from the group consisting of CaO, BaO and SrO.

Abstract: A nonreducing dielectric ceramic comprising a (Sr, Ca)(Ti, Zr)O3-based perovskite principal crystal phase containing 55 mole percent or more of SrTiO3 and whose powder CuK? X-ray diffraction pattern exhibits a ratio of less than 5% of the maximum peak intensity of the accessory crystal phases being the other crystal phases to the intensity of the maximum peak of the perovskite crystal phase, which is present at 2?=25° to 35°. This strontium titanate-based nonreducing dielectric ceramic has a high relative dielectric constant of 150 or more, a low third-order harmonic distortion ratio, and an excellent reliability in a high temperature-loading test. Accordingly, it is advantageously used for forming dielectric ceramic layers of a monolithic ceramic capacitor.

Abstract: A dielectric ceramic material as claimed in claim 1 with a composition of formula xCaTiO3+(1?x)SmzRe(1-z)AlO3 ??(1) optionally doped with about 0.005% to about 5% of CeO2 as a dopant, wherein 0.5?x?0.9, 0.3?z?0.995, or Re may be selected from a group consisting of La, Pr, Dy, Gd, Y, Er, Ho and mixtures thereof.

Abstract: A translucent ceramic having a high light transmittance is provided. It contains a perovskite compound having a composition represented by a general formula: (Ba1-s-tSrsCat)(MxB1yB2z)vOw (where M contains at least one of Sn, Zr and Hf, B1 represents at least one of Mg, Zn, Y and In, B2 represents at least one of Ta and Nb, each of conditions of 0?s?0.99, 0.01?t?0.45, x+y+z=1, 0<x?0.9, 1.00?z/y?2.40, and 0.97?v?1.05 is satisfied, and w represents a positive number for maintaining electrical neutrality) as a primary component. This translucent ceramic can be used as, for example, an objective lens (2) of an optical pickup (9) to provide advantages. In another aspect some of M is replaced by Ti.

Abstract: The present invention has an object to provide piezoelectric ceramics containing no lead, having a high Curie point, and further, having excellent piezoelectric properties, particularly large Qmax. The piezoelectric ceramics contain, as a main component, a bismuth layer-structured compound having (MII1-xLnx)Bi4Ti4O15 crystals (MII is an element selected from Sr, Ba, and Ca, Ln is an element selected from lanthanoids, and x is within a range of 0<x?0.5) and further contain, as secondary components, at least one of Mn oxide and Co oxide, and lanthanoid, wherein the lanthanoid being the secondary component is contained within a range of 0.02 to 0.12 wt % in terms of oxide thereof.

Abstract: According to one exemplary embodiment, a dielectric ceramic composition includes a main component group, where the main component group is represented by MgxCayZnzTiO2+x+y+z, where the sum of x, y, and z is less than or equal to 1.0 such that the dielectric ceramic composition has a wider sintering temperature range and reduced exaggerated grain growth. According to one embodiment, x can be greater than 0.0 and less than 1.0, y can be greater than 0.0 and less than 1.0, and z can be greater than 0.0 and less than 1.0. The dielectric ceramic composition can further include between 0.0 and 50.0 percent by weight of aluminum oxide. The dielectric ceramic composition can further include copper oxide. The dielectric ceramic composition can further include boron oxide.

Abstract: A glass-ceramic composition contains first ceramic particles principally containing forsterite; second ceramic particles principally containing at least one selected from the group consisting of calcium titanate, strontium titanate, and titanium oxide; and borosilicate glass particles containing about 3% to 15% lithium oxide, about 20% to 50% magnesium oxide, about 15% to 30% boron oxide, about 10% to 45% silicon oxide, about 6% to 20% zinc oxide, 0% to about 15% aluminum oxide, and at least one additive selected from the group consisting of calcium oxide, barium oxide, and strontium oxide on a weight basis. The content of the borosilicate glass particles is about 3% or more; the lower limit of the content of the additive is about 2%; and the upper limit of the additive content is about 15%, about 25%, or about 25% when the additive is calcium oxide, barium oxide, or strontium oxide, respectively, on a weight basis.

Abstract: Crystal grains mainly composed of barium titanate have a mean grain size of not more than 0.2 ?m. The volume per unit cell V that is represented by a product of lattice constant (a, b, c) figured out from the X-ray diffraction pattern of the crystal grains is not more than 0.0643 nm3. Thereby, a dielectric ceramics having high relative dielectric constant can be obtained. A multilayer ceramic capacitor comprises a capacitor body and an external electrode that is formed at both ends of the capacitor body. The capacitor body comprises dielectric layers composed of the dielectric ceramics, and internal electrode layers. The dielectric layers and the internal electrode layers are alternately laminated.

Abstract: A dielectric ceramic composition of the present invention is represented by the general formula, MgxSiO2+x+aSryTiO2+y, wherein x, y and a satisfy the relations of 1.70?x?1.99, 0.98?y?1.02, and 0.05?a?0.40, respectively.

Abstract: An insulating ceramic composition forming insulating ceramic layers (3) stacked in a multilayer ceramic substrate (2) used in a monolithic ceramic electronic component, such as a multilayer ceramic module (1). The insulating ceramic composition contains a first ceramic powder mainly containing forsterite, a second ceramic powder mainly containing at least one compound selected from the group consisting of CaTiO3, SrTiO3, and TiO2, and a borosilicate glass powder. The borosilicate glass powder contains 3 to 15 percent by weight of lithium in terms of Li2O, 30 to 50 percent by weight of magnesium in terms of MgO, 15 to 30 percent by weight of boron in terms of B2O3, 10 to 35 percent by weight of silicon in terms of SiO2, 6 to 20 percent by weight of zinc in terms of ZnO, and 0 to 15 percent by weight of aluminum in terms of Al2O3. The insulating ceramic composition can be fired at a temperature of 1000° C.

Abstract: A dielectric ceramic material consisting essentially of a composition of Formula 1 xATiO3(1?x)NdzRe(1?z)AlO3 ??(1) doped with 0.005% to 5% of a dopant selected from the group consisting of: cerium oxide, manganese oxide and mixtures thereof; wherein A may be selected from the group consisting of: Ca, Sr, Mg and mixtures thereof; Re may be selected from a group consisting of La, Sm, Pr, Dy, Er, Gd, Y and mixtures thereof; wherein z is from 0.95 to 0.995; and wherein x is a positive number less than 1.

Abstract: A thin film capacity element composition includes a first bismuth layer-structured compound having positive temperature characteristics, that a specific permittivity rises as the temperature rises, in at least a part of a predetermined temperature range and a second bismuth layer-structured compound having negative temperature characteristics, that a specific permittivity declines as a temperature rises, in at least a part of said predetermined temperature range at any mixing ratio; wherein the bismuth layer-structured compound is expressed by a composition formula of CaxSr(1-x)Bi4Ti4O15.

Abstract: A dielectric ceramic composition, comprising a main component including at least a dielectric oxide having a composition expressed by [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2], a first subcomponent including a Mn oxide and/or an Al oxide and a glass component, wherein “m”, “x”, “y” and “z” indicating composition mole ratios in the formula included in the main component are in relationships of 0.90?m?1.04, preferably 1.005?m?1.025, 0.5?x<1, preferably 0.6?x?0.9, 0.01?y?0.10, preferably 0.02?y?0.07 and 0<z?0.20, preferably 0<z?0.10.

Abstract: Provided is a piezoelectric ceramic with a wider operating temperature range capable of obtaining a larger amount of displacement and being easily sintered, as well as being superior in terms of ultra-low emission, environmental friendliness and ecology. A piezoelectric substrate 1 comprises a composition including a perovskite-type oxide (Na1?x?y?zKxLiyAgz)(Nb1?wTaw)O3 and a tungsten bronze-type oxide M(Nb1?vTav)2O6 (M is an element of Group 2 in the long form of the periodic table of the elements). The values of x, y and z are preferably within a range of 0.1?x?0.9, 0?y?0.2, and 0?z?0.05, respectively. The content of the tungsten bronze-type oxide is preferably 5.3 mol % or less. Thereby, a higher Curie temperature and a larger amount of displacement can be obtained, and sintering can be more easily carried out.

Abstract: The present invention relates to a method for manufacturing a SrTiO3 series varistor using grain boundary segregation, and more particularly, to a method for manufacturing a SrTiO3 series varistor by sintering a powdered composition in which acceptors such as Al and Fe are added in powdered form and then sintered under a reducing atmosphere and heat-treated them in the air to selectively form electrical conduction barriers at grain boundaries in a process for manufacturing SrTiO3 series varistor having an excellent non-linear coefficient and a breakdown voltage suitable for use.

Abstract: A process for producing powders of metal compound containing oxygen including the steps of: feeding at least one material selected from a liquid material and a solution material obtained by dissolving solid ingredient in organic solvent via a liquid flow controller into a vaporizer; vaporizing the materials in the vaporizer; adding oxygen; heating; cooling; and crystallizing. Also disclosed is the product formed by this process, and apparatus used in performing the process. The process and the apparatus enable easily mass-producing fine powders of metal compound containing oxygen used as materials for optical crystals, nonlinear crystals or magneto-optical crystals with reasonable production cost.

Abstract: The production of low-loss, tunable composite ceramic materials with improved breakdown strengths is disclosed. The composite materials comprise ferroelectric perovskites such as barium strontium titanate or other ferroelectric perovskites combined with other phases such as low-loss silicate materials and/or other low-loss oxides. The composite materials are produced in sheet or tape form by methods such as tape casting. The composite tapes exhibit favorable tunability, low loss and tailorable dielectric properties, and can be used in various microwave devices.

Abstract: A translucent ceramic principally contains a composition represented by the formula Ba{Tix1Mx2(Mg1-tZnt)y(Ta1-uNbu)z}vOw, wherein M is at least one selected from the group consisting of Sn, Zr, and Hf; w is a positive number for maintaining the electrical neutrality; x1+x2+y+z=1; 0.015?x1+x2?0.90; 0<x1?0.90; 0?x2?0.60; 1.60?z/y?2.40; 1.00?v?1.05; 0<t<1; and 0?u?1. The translucent ceramic has high linear transmittance over a wide wavelength range and a large refractive index, is controllable in refractive index and Abbe number in a wide range, and is not birefringent. Therefore, lenses (2) made of the translucent ceramic are suitable for optical pickups (9) and other devices that must be small-sized and thin.

Abstract: A material made of a dielectric oxide of type Ca0.25Cu0.75TiO3 having a dielectric constant greater than 3,000.

Abstract: A perovskite catalyst is prepared using a ceramic sol-sol methodology comprising preparing slurry in water of an alkaline earth metal salt, a powdered metal salt and a powdered transition metal oxide, adding a polymeric binder to form a paste, drying and comminuting the paste into a powder and heating the powder with a temperature profile to calcination temperatures. In one embodiment the slurry is formed of titanium oxide with barium carbonate and tin chloride in deionized water, and more specifically by a mixture according to Ba (1-0.05x)+TiO2+SnCl2(0.05x) where x is in moles. The perovskite catalyst is preferably used in a process for oxidative coupling of methane. Catalyst performance is enhanced through the addition of halides to the feed gas in the reaction.

Abstract: Provided is a dielectric composition which, when applied to an electron emitter, enables suppression of reduction of electron emission quantity with passage of time. The dielectric composition contains, as a primary component, a PMN-PZ-PT ternary solid solution composition represented by the following formula PbxBip(Mgy/3Nb2/3)aTib-zMzZrcO3 [wherein x, p, and y satisfy the following relations: 0.85?x?1.05, 0.02?p?0.1, and 0.8?y?1.0; a, b, and c are decimal numbers falling within a region formed by connecting the following five points (0.550, 0.425, 0.025), (0.550, 0.150, 0.300), (0.100, 0.150, 0.750), (0.100, 0.525, 0.375), and (0.375, 0.425, 0.200); z satisfies the following relation: 0.02?z?0.10; and M is at least one element selected from among Nb, Ta, Mo, and W], and contains Ni in an amount of 0.05 to 2.0 wt. % as reduced to NiO.

Abstract: A dielectric ceramic composition includes a main component including a dielectric oxide expressed by a composition formula of {(Ca1-xSrx)O}m.(Zr1-yTiy)O2, wherein m, x and y indicating composition mole ratios in the composition formula are in relationships of 0.8?m?1.3, 0x?1.00 and 0.1?y?0.8; a first subcomponent including a V oxide; and a second subcomponent including an Al oxide; wherein ratios of respective components with respect to 100 moles of said main component are the first subcomponent: 0 mole<first subcomponent<7 moles (wherein the value is a V oxide value in terms of V2O5); and the second subcomponent: 0 mole<second subcomponent<15 moles (wherein the value is an Al oxide value in terms of Al2O3).

Abstract: A dielectric ceramic composition characterized as containing a dielectric material which contains a dielectric composition represented by the compositional formula a.Li2O-b.(CaO1?x—SrOx)-c.R2O3-d.TiO2 (wherein x satisfies 0?x<1; R is at least one selected from La, Y and other rare-earth metals; and a, b, c and d satisfy 0?a?20 mol %, 0?b?45 mol %, 0<c?20 mol % and 40?d?80 mol %) and at least one of oxides of Group 4 and Group 14 metallic elements of the Periodic Table.

Abstract: A dielectric ceramic composition, comprising a main component including a dielectric oxide, and a sintering auxiliary comprising a first component including an oxide of Li and a second component including an oxide of M1 (note that M1 is at least one kind of element selected from group V elements and VI group elements): wherein said dielectric ceramic composition comprises a plurality of dielectric particles and crystal grain boundaries existing between said dielectric particles next to each other; concentration of M1 element becomes lower from a particle surface to inside thereof in the plurality of dielectric particles; and when assuming that a particle diameter of said dielectric particles is D and a content ratio of the M1 element at said crystal grain boundaries is 100%, a content ratio of the M1 element at a depth T50, where a depth from the particle surface is 50% of said particle diameter D, is 3 to 55%.

Abstract: A dielectric glass-ceramic substrate composed of a dielectric glass-ceramic composition is disclosed. The dielectric glass-ceramic composition includes a ceramic material and a Ba—B—Si glass material. Also, a method of manufacturing a dielectric glass-ceramic substrate includes steps of: mixing a ceramic material and a Ba—B—Si glass material with an organic carrier, forming the ceramic material, the Ba—B—Si glass material and the organic carrier as a pre-mold; and firing the pre-mold to form the dielectric glass-ceramic substrate at a low temperature.

Abstract: The composite dielectric of the present invention contains an aromatic liquid crystal polyester and a dielectric ceramic powder arranged in the aromatic liquid crystal polyester, wherein the dielectric ceramic powder exhibits a Q value greater than 650 at a frequency of 1 GHz by perturbation. A wiring board comprising a composite dielectric sheet made of a composite dielectric having such a characteristic exhibits a high dielectric constant and a low dielectric dissipation factor, thereby yielding less transmission loss, and thus can favorably be used in electronic instruments driven in high-frequency regions.

Abstract: A dielectric ceramic composition which can be sintered at such a temperature of about 800 to 1000° C. as to permit incorporation of and multilayer formation with a low resistant conductor such as Ag or Cu by the simultaneous sintering with the low resistant conductor, which is sintered to form dielectric ceramics having a dielectric constant ?r of not more than 10, and a resonator having a large Q×f0 value and an absolute value in temperature coefficient ?f of resonance frequency f0 of not more than 20 ppm/° C., the value being easy to be controlled. The dielectric ceramic composition contains a glass component in an amount of 5 to 150 parts by weight based on 100 parts by weight of a main component represented by general formula: aZnAl2O4-bZn2SiO4-cTiO2-dZn2TiO4, in which the molar fractions of respective components a, b, c, and d satisfy 5.0?a?80.0 mol % 5.0?b?70.0 mol %, 5.0?c?27.5 mol %, 0?d?30.

Abstract: Process for preparing barium titanate or strontium titanate by reacting titanium alkoxides with barium hydroxide hydrate or strontium hydroxide hydrate in a C1–C8-alcohol or a glycol ether at from 50 to 150° C.

Abstract: Provided are a dielectric ceramic composition of forsterite system for microwave and millimeter-wave application and a method for forming the same. Here, the dielectric ceramic composition having a small dielectric loss is used for communication devices used at microwave and millimeter-wave bands. The dielectric ceramic composition includes forsterite (Mg2SiO4) as a main element and titanium oxide (TiO2), which is partially substituted for silicon (Si) in forsterite. The dielectric ceramic composition is obtained by using 56 to 57 wt % of MgO, 33 to 42 wt % of SiO2, and 1 to 11 wt % of TiO2, and adding an additive including Li ions as a sintering aid for improving a sintering characteristic. The dielectric ceramic composition is formed by mixing MgO, SiO2, and TiO2, calcining the mixture to form forsterite powder, adding an additive including Li ion, for example, Li2CO3, and shaping and sintering the mixture.

Abstract: A dielectric ceramic composition containing a dielectric component represented by the compositional formula a.Li2O-b.(CaO1-x—SrOx)-c.R2O3-d.TiO2 (wherein x satisfies 0?x<1; R is at least one selected from rare-earth elements; and a, b, c and d satisfy 0?a?20 mol %, 0 ?b?45 mol %, 0<c?20 mol %, 40?d?80 mol % and a+b+c+d=100 mol %). The composition, after being fired, shows the presence of a main phase having a perovskite structure and an acicular phase containing a rare-earth element.

Abstract: A dielectric ceramic composition obtained by firing a mixture containing a glass component and a dielectric component represented by the compositional formula a.Li2O-b.(CaO1-x—SrOx)-c.R2O3-d.TiO2 (wherein x satisfies 0?x<1; R is at least one selected from La, Y and other rare-earth metals; and a, b, c and d satisfy 0?a?20 mol %, 0?b?45 mol %, 0<c?20 mol %, 40?d?80 mol % and a+b+c+d=100 mol %). The dielectric component is prepared by calcining a raw material. The glass component contains at least a bismuth glass. After the firing, a ratio (second phase/first phase) in X-ray diffraction peak intensity of the second phase containing the rare-earth element to the first phase having a perovskite structure, as a main phase, does not exceed 20%.

Abstract: A dielectric material containing at least one of Ca and Sr, Ti, Al, at least one of Nb and Ta, and O, wherein these elements fulfill the following four requirements when represented by a compositional formula, aM1O-bTiO2-(½)cAl2O3-(½)dM22O5 wherein M1 represents the at least one of Ca and Sr; M2 represents the at least one of Nb and Ta; and a, b, c and d represent each a molar ratio, provided that a+b+c+d=1: 0.436<a?0.500; 0.124<b?0.325; 0.054<c?0.150; and 0.170<d<0.346.

Abstract: A dielectric ceramic, and capacitor with the ceramic, wherein the ceramic has: about 94–99.9 wt % a first component defined by Formula 1; [(Ca1-xSrx)O]m(Zr1-yTiy)O2Formula 1 wherein: x is no more than about 0.6; and y is no more than about 0.1; and m is at least about 0.85 to no more than about 1.15; and about 0.1–5 wt % a secondary component defined by Formula 2; aSiO2-b[?B2O3-(1??)Li2O]-cAOFormula 2 wherein: a, b and c are selected to lie within the region defined by points A(a=15, b=0, c=85), B(a=70, b=0, c=30), C(a=0, b=70, c=30) and D(a=0, b=15, c=85) of a ternary diagram wherein a is mole percent SiO2; b is mole percent ?B2O3-(1??)Li2O; and c is mole percent AO and a+b+c=100 including the lines BC, CD and AD but excluding the line AB; ? is 0 to 1; A is selected from Mg, Ca, Sr, Ba or a combination thereof; and 0–2 wt % MnO2.

Abstract: The present invention provides a process for preparing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula: MgxAl2(1?x)Ti(1+x)O5 wherein the value of x is 0.1?x<1. The process comprises a step of sintering a formed product from a raw material mixture comprising 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the above composition formula, and 1–10 parts by weight of an alkali feldspar represented by the composition formula: (NayK1?y)AlSi3O8 wherein the value of y is 0?y?1.

Abstract: A dielectric porcelain composition includes MgTiO3 and Mg2SiO4 and satisfies a+b=1 and 0<b<1, wherein a denotes a molar ratio of MgTiO3 and b denotes a molar ratio of Mg2SiO4. It can include MgTiO3 and CaTiO3 and satisfy a+c=1 and 0<c?0.15, wherein a has the same meaning as shown above and c denotes a molar ratio of CaTiO3. It can also include MgTiO3, Mg2SiO4 and CaTiO3 and satisfy a+b+c=1, 0<b<1 and 0<c?0.15, wherein a, b and c have the same meanings as shown above. These compositions can be manufactured, with the content of Mg2SiO4, the content of CatiO3 and the contents of Mg2SiO4 and CaTiO3 adjusted, respectively. These compositions can be used as dielectric materials to manufacture dielectric resonators.

Abstract: A method of production of a reduction resistant dielectric ceramic composition having a superior low frequency dielectric characteristic and further improved in accelerated lifetime of insulation resistance, specifically a method of production of a dielectric ceramic composition containing a main component including a dielectric oxide of a specific composition, a first subcomponent including a V oxide, a second subcomponent containing an Al oxide, a third subcomponent containing an Mn oxide, and a fourth subcomponent containing a specific sintering aid in a specific ratio, including a step of mixing at least part of the materials of the subcomponents excluding one or both of at least the material of the third subcomponent and material of the fourth subcomponent with the starting materials prepared for obtaining the material of the main component to prepare the pre-reaction material, a step of causing the prepared pre-reaction material to react to obtain a reacted material, and a step of mixing the materials o