Dielectric dispersion of the complex perovskite oxide Ba(Fe1/2Nb1/2)O3 at low frequencies

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[1] Yokosuka, Masaru
来源：
Yokosuka, Masaru | 1600年 / JJAP, Minato-ku, Japan卷 / 34期
关键词：
Barium compounds - Ceramic materials - Crystal structure - Dielectric properties of solids - Electric conductivity of solids - Grain boundaries - Interfaces (materials) - Permittivity - Perovskite - Polarization - Sintering - Thermal effects;
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摘要：
Ceramic specimens of the complex perovskite oxide Ba(Fe1/2Nb1/2)O3 were fabricated by conventional solid state sintering. Dielectric constants were measured as a function of temperature as well as of frequency. As a result, dielectric constants showed an unusual temperature dependence. Moreover, a large dielectric dispersion was observed below 1 MHz, and it was represented by the Cole-Cole circular arc law. The present dielectric dispersion was interpreted on the basis of the interfacial polarization at the grain boundary region.
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