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BaTiO 3 –Bi(Mg 2/3 Nb 1/3 )O 3 Ceramics for High‐Temperature Capacitor Applications
Author(s) -
Muhammad Raz,
Iqbal Yaseen,
Reaney Ian M
Publication year - 2016
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/jace.14212
Subject(s) - materials science , ceramic , capacitor , sintering , analytical chemistry (journal) , dielectric , ceramic capacitor , dissipation factor , electrical resistivity and conductivity , permittivity , relative permittivity , activation energy , mineralogy , composite material , chemistry , electrical engineering , optoelectronics , chromatography , voltage , engineering
Solid solutions of (1− x )BaTiO 3 – x Bi(Mg 2/3 Nb 1/3 )O 3 (0 ≤ x ≤ 0.6) were prepared via a standard mixed‐oxide solid‐state sintering route and investigated for potential use in high‐temperature capacitor applications. Samples with 0.4 ≤ x ≤ 0.6 showed a temperature independent plateau in permittivity (ε r ). Optimum properties were obtained for x = 0.5 which exhibited a broad and stable relative ε r ~940 ± 15% from ~25°C to 550°C with a loss tangent <0.025 from 74°C to 455°C. The resistivity of samples increased with increasing Bi(Mg 2/3 Nb 1/3 )O 3 concentration. The activation energies of the bulk were observed to increase from 1.18 to 2.25 eV with an increase in x from 0 to 0.6. These ceramics exhibited excellent temperature stable dielectric properties and are promising candidates for high‐temperature multilayer ceramic capacitors for automotive applications.