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High‐ K Dielectric Ceramics from Donor/Acceptor‐Codoped (Ba 1− x Cax)(Ti 1‐y Zr y )O 3 (BCTZ)
Author(s) -
Hansen Peter,
Hennings Detlev,
Schreinemacher Herbert
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02494.x
Subject(s) - dielectric , materials science , annealing (glass) , acceptor , grain size , ceramic , curie temperature , analytical chemistry (journal) , doping , grain boundary , oxygen , dielectric loss , mineralogy , metallurgy , chemistry , condensed matter physics , microstructure , optoelectronics , physics , organic chemistry , chromatography , ferromagnetism
(Ba 1− x Ca x )(Ti 1− y Zr y )O 3 ceramics doped with various donors and acceptors were sintered in a reducing atmosphere and then annealed at different oxygen partial pressures. The dielectric maxima at the Curie point increased up to ∼30000 after reoxidation, depending on the grain size, the type of acceptor, and the annealing conditions. The increase of the dielectric maxima seems to be correlated with oxidation of the grain boundaries. The dielectric properties show relaxation effects with increased frequency.