Premium
Dielectric and Percolative Properties of Ba 0.5 Sr 0.5 TiO 3 –Mg 3 B 2 O 6 Composite Ceramics
Author(s) -
Zhang Qiwei,
Zhai Jiwei,
Yao Xi
Publication year - 2011
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.1551-2916.2010.04165.x
Subject(s) - materials science , dielectric , composite number , composite material , percolation threshold , ferroelectric ceramics , ceramic , dissipation factor , volume fraction , ferroelectricity , percolation (cognitive psychology) , percolation theory , electrical resistivity and conductivity , condensed matter physics , conductivity , chemistry , physics , optoelectronics , neuroscience , biology , quantum mechanics
A rather complete set of experimental data of the (1− x )Ba 0.5 Sr 0.5 TiO 3 – x Mg 3 B 2 O 6 system were provided, and the dielectric (DE) properties dependences on the volume fraction of Mg 3 B 2 O 6 phase were extensively investigated. The results showed that below the solution limit of Mg 2+ , the DE constant and loss tangent were substantially reduced, in comparison with that of pure Ba 0.5 Sr 0.5 TiO 3 . With the increasing volume fractions of Mg 3 B 2 O 6 inclusion, the DE constant decreased monotonously, nevertheless, the tunability of composites had no significant variations from 21.5% to 18.9% under an applied electric field of 30 kV/cm in a wide range up to 67 vol%, and above the percolation threshold (67 vol%), we observed an obvious drop of the tunabilities of composite system. These results are in accordance with the prediction of the modeled results of ferroelectric–DE composites in a spherical inclusion model.