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Dielectric Relaxations in Bi 2 O 3 –Nb 2 O 5 –NiO Cubic Pyrochlores
Author(s) -
Valant Matjaz
Publication year - 2009
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.1551-2916.2009.02984.x
Subject(s) - pyrochlore , non blocking i/o , dielectric , materials science , relaxation (psychology) , condensed matter physics , solid solution , atmospheric temperature range , homogeneity (statistics) , mineralogy , thermodynamics , chemistry , phase (matter) , physics , metallurgy , optoelectronics , psychology , social psychology , biochemistry , organic chemistry , catalysis , statistics , mathematics
Dielectric properties of pyrochlores compositions from Bi 2 O 3 –Nb 2 O 5 –NiO system were analyzed. The dielectric properties are dominated with a low‐temperature relaxation that is typical for Bi‐pyrochlores. A vast pyrochlore homogeneity range that exists in this system allowed to correlate characteristics of the observed relaxations with a compositional variations within the A 2 O′‐ and B 2 O 6 pyrochlore sublattice. It was possible to make a distinction between different influences of the two sublattices, which can be satisfactorily described by the existing relaxation model for Bi 3/2 ZnNb 3/2 O 7 . A new relaxor‐like room temperature relaxation was found for Bi 1.6 Ni 0.57 Nb 1.43 O 6.55 .