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Microscopic Calculation of Dielectric Loss at Microwave Frequencies for Complex Perovskite Ba(Zn 1/3 Ta 2/3 )O 3
Author(s) -
Sagala Djuniadi A.,
Nambu Shinji
Publication year - 1992
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.1151-2916.1992.tb05613.x
Subject(s) - microwave , dissipation factor , perovskite (structure) , dielectric loss , dielectric , ion , tangent , degree (music) , materials science , chemistry , mineralogy , condensed matter physics , analytical chemistry (journal) , crystallography , physics , mathematics , geometry , organic chemistry , optoelectronics , quantum mechanics , acoustics , chromatography
The dielectric loss tangent at microwave frequencies for the complex perovskite Ba(Zn 1/3 Ta 2/3 )O 3 was calculated with respect to the degree of structural disorder on B sites. Starting out from the equations of ion motion, dielectric loss was expressed in terms of the pair‐correlation functions corresponding to the ordering of Zn and Ta ions on B sites. The characteristic length included in the pair‐correlation functions corresponds to the average size of the region containing disorder in ion arrangements on B sites; thus the relation between the structural disorder on the B site and the dielectric loss tangent at microwave frequencies was clarified theoretically. The numerical results show that the microwave loss tangent values change their power from – 3 to – 6 with increasing degree of order on the B site, which agrees well with the experimental observations. Results obtained here confirm the physical origin of the microwave loss of complex perovskite Ba(Zn 1/3 Ta 2/3 )O 3 .