BaTiO3-Bi(Mg2/3Nb1/3)O3 Ceramics for High-Temperature Capacitor Applications

Raz Muhammad, Yaseen Iqbal, Ian M. Reaney, C. Randall

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Abstract

Solid solutions of (1-x)BaTiO3-xBi(Mg2/3Nb1/3)O3 (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 (ϵr). Optimum properties were obtained for x = 0.5 which exhibited a broad and stable relative ϵr ~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(Mg2/3Nb1/3)O3 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.

Original languageEnglish (US)
Pages (from-to)2089-2095
Number of pages7
JournalJournal of the American Ceramic Society
Volume99
Issue number6
DOIs
Publication statusPublished - Jun 1 2016

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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