4.7 Article Proceedings Paper

Dielectric and ferroelectric properties of BiFeO3 ceramics sintered in different atmospheres

期刊

CERAMICS INTERNATIONAL
卷 39, 期 -, 页码 S217-S220

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ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.10.065

关键词

Microwave processing; Dielectric properties; Ferroelectric properties

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Pure BiFeO3 powders were successfully synthesized by microwave-hydrothermal processing, and the pellets were sintered in different atmospheres. The properties of BiFeO3 ceramic samples were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), dielectric measurements (LCR) and polarization-field hysteresis loop. The effects of different atmospheres (including air, N-2, O-2 and H-2) on ferroelectric properties of BiFeO3 ceramics were studied in this paper. The results show that the BiFeO3 ceramics sintered in H-2 and N-2 atmosphere have a single-phase rhombohedra distorted perovskite structure with no trace of other impurity phases. The dielectric properties of BiFeO3 ceramics were greatly influenced by O-2 and H-2 atmospheres. The samples sintered in H-2 atmosphere have the highest dielectric constant. Polarization-field hysteresis loops measured at room temperature indicated the samples sintered in H-2 and N-2 atmospheres have higher spontaneous polarization and lower breakdown field, but the ferroelectric properties of samples sintered in O-2 atmospheres were poor. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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