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Temperature‐stable unfilled tungsten bronze dielectric ceramics: Ba 3.5 Sm 1.5 Fe 0.75 Nb 9.25 O 30
Author(s) -
Hu Changzheng,
Sun Zhen,
Zhu Qihua,
Li Chunchun,
Liu Laijun,
Fang Liang
Publication year - 2016
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12642
Subject(s) - materials science , dielectric , tungsten , ceramic , microstructure , ceramic capacitor , bronze , ferroelectricity , analytical chemistry (journal) , atmospheric temperature range , coercivity , capacitor , metallurgy , condensed matter physics , optoelectronics , electrical engineering , voltage , thermodynamics , engineering , chemistry , physics , chromatography
Unfilled tungsten bronze ceramic Ba 3.5 Sm 1.5 Fe 0.75 Nb 9.25 O 30 was prepared by a conventional solid‐state reaction method. Its structure, microstructure, and dielectric properties were investigated. Dielectric behaviors indicate that the ceramics are ferroelectric at room temperature with a remnant polarization ~1.61 μC/cm 2 and a coercive field ~13.91 kV/cm. Ba 3.5 Sm 1.5 Fe 0.75 Nb 9.25 O 30 ceramics have temperature stability with a high dielectric constant (ε r ) varying from 172 to 202 at the temperature range −55 to 200°C (at 1 MH z). Capacitance change rate of the sample is less than 15%. These results indicate that Ba 3.5 Sm 1.5 Fe 0.75 Nb 9.25 O 30 ceramics might be promising in temperature‐stable multi‐layer ceramic capacitors.
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