BaTiO3–Bi(Mg2/3Nb1/3)O3 Ceramics for High‐Temperature Capacitor Applications. Issue 6 (22nd March 2016)

• Record Type: Journal Article
• Authors: Muhammad, Raz; Iqbal, Yaseen; Reaney, Ian M
• Editors: Randall, C.
• Is Part Of: Journal of the American Ceramic Society. Volume 99:Issue 6(2016)
• Page Start: 2089
• Page End: 2095
• Publication Date: 2016-03-22
• Subjects: dielectric materials/properties -- electroceramics -- lead‐free ceramics -- impedance spectroscopy; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14212
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract : Solid solutions of (1− x )BaTiO3 – x Bi(Mg2/3 Nb1/3 )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(Mg2/3 Nb1/3 )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.