Barium-strontium titanate-bismuth oxide ceramic dielectric - contg. titanium dioxide, giving high dielectric constant and low loss

摘要

Ceramic dielectric based on BaTiO3 and SrTiO3 with added Bi2O3 contains 18-70 (wt.) % SrTiO3, 4-75% BaTiO3 and 2.5-17.4% Bi2O3 and also contains 1.7-20% TiO2, the TiO2/Bi2O3 wt. ratio being between 1 and 18. The dielectric can also contain small amts. (pref. 0.2-0.5%) of clay and/or oxide(s) of Mn, Cr, Nb, Ta, Fe, Co and/or rare earths such as La and Ce; whilst less than 30% of the total amt. of SrTiO3 and BaTiO3 can be replaced by CaTiO3, ZnTiO3, MgTiO3 and/or CdTiO3 or less than 50% of these by PbTiO3; and less than 30% of the total amt. of TiO2, SrTiO3 and BaTiO3 by ZrO2, SnO2 and/or HfO2. The ceramic is used in vacuum or gas circuit breakers and arrestors, voltage multiplier rectifiers in television receivers or oscilloscopes etc.