Ferroelectric properties of BiFeO3 ceramics sintered under low oxygen partial pressure

BiFeO 3 ceramics were prepared in various atmospheres with hydrothermally-synthesized BiFeO 3 crystalline powders, and their dielectric and ferroelectric properties were investigated. The single BiFeO 3 phase was formed when the sample was sintered at 800 °C under air, and a minor Bi 2 Fe 4 O 9 phas...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2012, 60(1), , pp.83-87
Main Authors: Kim, A. Young, Lee, Ye Ji, Kim, Jeong Seog, Han, Seung Ho, Kang, Hyung-Won, Lee, Hyeung-Gyu, Cheon, Chae Il
Format: Article
Language:English
Subjects:
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Theoretical
물리학
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Summary:BiFeO 3 ceramics were prepared in various atmospheres with hydrothermally-synthesized BiFeO 3 crystalline powders, and their dielectric and ferroelectric properties were investigated. The single BiFeO 3 phase was formed when the sample was sintered at 800 °C under air, and a minor Bi 2 Fe 4 O 9 phase was observed when it was sintered under a N 2 or an Ar atmosphere. The BiFeO 3 ceramic sintered under N 2 showed a dense microstructure and superior electric properties: a dielectric constant of 75, a low loss tangent of 0.01 at 100 kHz and a high resistivity of 1.37 × 10 11 Ω·cm. A pinched and asymmetric P-E hysteresis and a typical butterfly-shaped S-E loop were observed in the BiFeO 3 ceramic sintered under N 2 . The electric properties of BiFeO 3 ceramics sintered in various atmospheres are discussed on the basis of defect chemistry.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.60.83