Electrical properties of (Na,Ce) doped Bi5Ti3FeO15 ceramics

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Abstract
Bi5Ti3FeO15 (BTF) doped with (Na,Ce) was prepared by solid‐state reaction sintering. Effects of (Na,Ce) doping on the structure, microstructure, and electrical properties of BTF were investigated. The Curie point decreased from 759 to 711 °C with increasing dopant amount. At low temperatures (50–400 °C), peaks of dielectric losses only can be seen for BTF, Bi4.95Na0.025Ce0.025Ti3FeO15, and Bi4.90Na0.05Ce0.05Ti3FeO15 ceramics. The highest piezoelectric constant d33 of 13.4 pC/N is achieved for Bi4.80Na0.10Ce0.10Ti3FeO15 ceramics. At an applied electric field of 200 kV/cm, the polarization–electrical field and the current–electrical field hysteresis loops of Bi4.90Na0.05Ce0.05Ti3FeO15 ceramics are shown. This composition also has the highest room‐temperature resistivity, about 8 × 1012 Ω · cm.

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