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High‐Temperature Decomposition of B‐Site‐Ordered Perovskite Ba(Zn 1/2 W 1/2 )O 3
Author(s) -
Jancar Bostjan,
Bezjak Jana,
Davies Peter K.
Publication year - 2010
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.1551-2916.2009.03454.x
Subject(s) - sublimation (psychology) , materials science , perovskite (structure) , analytical chemistry (journal) , amorphous solid , microstructure , mineralogy , dielectric , decomposition , ceramic , crystallography , chemistry , metallurgy , psychology , optoelectronics , organic chemistry , chromatography , psychotherapist
The reactions during high‐temperature decomposition of Ba(Zn 1/2 W 1/2 )O 3 double perovskite, a potential microwave dielectric material, were studied by using X‐ray diffraction, electron microscopy, and Knudsen effusion combined with mass spectrometry. The results show that above 1200°C, the perovskite decomposes due to the sublimation of ZnO, which results in the formation of BaWO 4 , Ba 2 WO 5 , and amorphous BaO‐rich phases. The simultaneous presence of BaWO 4 and Ba 2 WO 5 causes the formation of a liquid phase above 1320°C, which in the case of ceramics results in a progressive deterioration of the microstructure. As a consequence, the dielectric losses of Ba(Zn 1/2 W 1/2 )O 3 ‐based ceramics strongly depend on the processing parameters.