Abstract: The dielectric ceramic composite according to the invention contains at least one kind of lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide and samarium oxide at an amount of 2.5-5.0 mol % and zirconium oxide, tin oxide and titanium oxide at an amount of 0.5-8.5 mol% in a formula (Zr.sub.1-a-b Sn.sub.a Ti.sub.b) O.sub.3 (where a>0, b.gtoreq.0, 0<a+b.ltoreq.1.0) to barium titanate of 100 mol % containing alkali metal oxide less than 0.03% by weight as an impurity. Barium zirconate and barium stannate at an amount of 0.5-5.0 mol % in a formula Ba (Zr.sub.1-a Sn.sub.a) O.sub.3 (where 0<a.ltoreq.1.0) and titanium oxide at an amount of 1.5-6.0 mol % may be added instead of zirconium oxide, tin oxide, titanium oxide.

Abstract: A monolithic ceramic capacitor is characterized in that dielectric ceramic layers are made up of a dielectric ceramic composition consisting essentially of a basic composition and an antireducing agent incorporated therein to prevent it from reduction. The basic composition mainly comprises barium titanate and a bismuth compound incorporated therein, and the internal electrodes comprises a copper or a copper alloy. The antireducing agent has a composition expressed by the general formula: ##EQU1## wherein RO is at least one oxide selected from the group consisting of MgO, CaO, SrO and BaO, .alpha., .beta. and .gamma. are molar percentages of the respective components and take a value within the following respective ranges, 5.ltoreq..alpha..ltoreq.20, 10.ltoreq..beta..ltoreq.60, 20.ltoreq..gamma..ltoreq.35. The internal electrode may contain at least one additive selected from the group consisting of glass frit, powered dielectric and antireducing agent.

Abstract: A dielectric ceramic composition consists essentially of a main component of a ternary system Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --Pb(Cu.sub.1/2 W.sub.1/2)O.sub.3 --PbTiO.sub.3, and contains a glass composition with a melting point of 600.degree. to 900.degree. C. in an amount of 0.5 to 1.5 parts by weight per 100 parts by weight of the main component. The main component has a composition represented by the general formula:xPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --yPb(Cu.sub.1/2 W.sub.1/2)O.sub.3 --zPbTiO.sub.3wherein x, y and z are mol fractions of respective components and take a set of values falling within a polygon ABCD defined by points A, B, C and D in FIG. 1, and x+y+z=1.00. The set of x, y and z at each point is as follows:______________________________________ x y z ______________________________________ A 0.75 0.10 0.15 B 0.75 0.05 0.20 C 0.95 0.03 0.02 D 0.95 0.05 0.

Abstract: A monolithic ceramic capacitor comprises a plurality of dielectric ceramic layers united into one body, a plurality of internal electrodes formed between adjacent dielectric ceramic layers, and external electrodes formed on opposite sides of the united ceramic each being connected to alternate internal electrodes. The internal electrodes are formed of a copper or a copper alloy. The dielectric ceramic layers are formed of a dielectric ceramic composition including strontium titanate, bismuth oxide and an antireducing agent which prevents the composition from reduction. The antireducing agent has a composition expressed by the general formula:.alpha.MnO.sub.2 +.beta.RO+.gamma.B.sub.2 O.sub.3 +(1-.alpha.-.beta.-.gamma.)SiO.sub.2, or.alpha.Li.sub.2)+.beta.RO+.gamma.B.sub.2 O.sub.3 +(1-.alpha.-.beta.-.gamma.)SiO.sub.2, or.alpha.ZnO+.beta.RO+.gamma.B.sub.2 O.sub.3 +(1-.alpha.-.beta.-.gamma.)SiO.sub.2, orwherein RO is at least one oxide selected from the group consisting of MgO, CaO, SrO and BaO, and .alpha.,.beta.

Abstract: Internal electrodes formed in the interior of a ceramic laminate of a monolithic ceramic capacitor comprise metal conductor parts and semiconductor parts. The semiconductor parts are exposed at both end surfaces of the ceramic laminate to be electrically connected with external electrodes. The external electrodes comprise baked layers of silver formed on the end surfaces of the ceramic laminate and metal plated films formed thereon. In formation of the metal plated films, a plating solution which may reach the end surfaces of the ceramic laminate through the baked layers is blocked by the semiconductor parts and prevented from infiltration into the metal conductor parts of the internal electrodes.

Abstract: A method of manufacturing a monolithic ceramic capacitor comprises forming a ceramic laminate body in which a plurality of inner electrodes are buried in layers and outer electrodes are formed on both end surfaces of the laminate body, and separated from said body by conductive ceramic films. In order to form the conductive ceramic films, a paste or a sheet of a conductive ceramic material is applied onto each end surface of the ceramic laminate body, and then fired.

Abstract: A ceramic capacitor obtained by preparing a ceramic compact containing a ceramic composition which is not semiconductive upon firing in a reducing atmosphere, applying first paste containing a reducing agent or dopant to the surface of the ceramic compact, applying second paste containing a base metal on the first paste and firing the ceramic compact with the first paste and the second paste in a reducing atmosphere. A ceramic body included in the ceramic capacitor is provided with a semiconductive layer by thermal diffusion of the dopant contained in the first paste. In a portion of the capacitor enclosed between a pair of capacitance extracting electrodes defined by the second paste, the thickness of a dielectric layer is reduced by that of the semiconductive layer.

Abstract: A dielectric ceramic composition consists essentially of a main component of a SrTiO.sub.3 --PbTiO.sub.3 --Bi.sub.2 O.sub.3 --TiO.sub.2 --CaTiO.sub.3 system and secondary components of manganese oxides, at least one oxide of rare earth elements selected from the group consisting of Nd, La, Ce, Pr and Sm, and one of complex perovskite compounds expressed by the following general formula:A(Cu.sub.1/2 W.sub.1/2)O.sub.3(where A is at least one element selected from the group consisting of Pb, Sr and Ca),A(Cu.sub.1/3 Ta.sub.2/3)O.sub.3wherein A is at least one element selected from the group consisting of Pb, Sr and Ca), andA(Cu.sub.1/3 Nb.sub.2/3)O.sub.3(where A is at least one element selected from the group consisting of Pb, Sr and Ca). The main component consists essentially, by weight, of 19.5 to 42.8% of SrTiO.sub.3, 8.0 to 37.6% of PbTiO.sub.3, 4.2 to 33.9% of CaTiO.sub.3, 4.4 to 26.9% of Bi.sub.2 O.sub.3, 4.2 to 13.6% of TiO.sub.2 and 0.5 to 12% of SnO.sub.2.

Abstract: A dielectric ceramic composition consists essentially of a basic component composed of 35 to 70 wt % of SrTiO.sub.3, 0.5 to 16 wt % of MgTiO.sub.3, 1.0 to 12 wt % of CaTiO.sub.3, 5 to 32 wt % of Bi.sub.2 O.sub.3 and 5 to 16 wt % of TiO.sub.2, and additives composed of CuO, MnO.sub.2 and CeO.sub.2. The contents of the additives per 100 parts by weight of the main component are 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO.sub.2, and 1.0 to 8.0 parts by weight for CeO.sub.2, respectively. The composition possesses a high dielectric constant of more than 500, a high Q value of more than 1000 at 1 MHz, a small temperature change rate of capacitance of a maximum of -7.2% at +85.degree. C., and a small change rate of capacitance with direct current voltage.