| 摘要 |
FINE GRAINED BaTiO3 POWDER MIXTURE AND METHOD FOR MAKING Disc and multilayer ceramic capacitors having a fine grained barium titanate body exhibit a high dielectric constant and a smooth (X7R) temperature coefficient of capacitance. Such capacitors are made by mixing barium titanate powder of less than 0.7 micron average particle size, with around 2 weight percent of a cadmium silicate flux serving as a reactivity and sintering promoter and one weight percent Nb2O5 serving as a reactivity and sintering inhibitor. After preparing a green body of this mixture, the body is sintered at about 1100.degree.C. A powder mixture for manufacture of such capacitors includes mixing powders of the three above-described materials, mildly sintering the powder mixture and if necessary comminuting the calcine to produce a ceramic powder of agglomerates of the start powders, each agglomerate having the same composition as did the precursor mixture.
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