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Niedrig sinternde keramische Dielektrika mit hohen DK-Werten fuer Green-Tape-Systeme

Low sintering ceramic dielectric with high dielectric values for green tape systems
: Gesemann, H.J.; Schoenecker, A.; Voelker, K.

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DE 1994-4406812 A: 19940302
DE 1994-4406812 A: 19940302
DE 4406812 C1: 19950706
Patent, Elektronische Publikation
Fraunhofer IKTS ()

The invention relates to the fields of electrical engineering and electronics and affects dielectrics which can be used in green tape systems as high-dielectric film. The task of the invention consists in finding a ceramic composition glass active substance fulfilling the following requirements: - compatible with existing film, i.e. sinterable at 900 degrees C/10 min, - dielectric values > 200 - characteristics: type II X7R. The task is solved by the fact that the dielectrics contain an active substance and a glass. The active substance consists of a nuclear edge layer compound, whereby the nucleus is BaTiO<-3 and a layer of preformed lead perovskite of the type (Pb<-a A<-1,02-a)(B<-1 B<-2 )0<-3 is applied about said nucleus at least at 1000 degrees C. The active substance is embedded in a lead borosilicate glass, which contains PbO of 50 to 90 percent by weight B<-2 0<-3 of 3 to 30 percent by weight and SiO<-2 of 0.5 to 20 percent by weight.