Ceramic dielectrics with controlled temperature coefficients of permittivity

Abstract
Electrical properties of a number of ceramics containing calcium titanate with additions of 2Bi2O3 5TiO2 and others consisting essentially of Bi2O3 2TiO2 have been measured, and a composition CaTiO3, 0.08(2Bi2O3, 5TiO2 has been prepared with a permittivity of 187, low loss (tan δ6degC.The electrical properties of ceramics consisting of calcium titanate and calcium titanosilicate have also been studied and found to include a zero-temperature-coefficient composition with a permittivity of more than 80 and low loss (tan δ<0.0005 at 1 Mc/s).Xray data for these ceramics are given, and the occurrence in them of a cubic pyrochlore-type phase of bismuth titanate is reported. This pyrochlore type of bismuth titanate may be produced with a zero temperature coefficient of permittivity.The possible use of some of these ceramics as capacitor dielectrics with controlled temperature coefficients is indicated.

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