CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Investigation on dependence of BiFeO3 dielectric property on oxygen content |
Lou Yan-Hui(娄艳辉), Song Gui-Lin(宋桂林), Chang Fang-Gao(常方高), and Wang Zhao-Kui(王照奎)† |
Department of Physics, Henan Normal University, Xinxiang 453007, China |
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Abstract The influence of oxygen content on the dielectric property of BiFeO3 ceramics is studied by experiment and first-principles calculation. The experimental result demonstrates that the dielectric constant of BiFeO3 is strongly dependent on introduced oxygen and oxygen vacancies. By comparison with BiFeO3, the introduced oxygen and oxygen vacancies can lead to a reduction in dielectric constant of BiFeO$\delta$ at a lower frequency. The first-principles calculation also shows a similar result when photon energy is in a range of 2.0—4.1 eV. A likely explanation is that this oxygen content dependence may be ascribed to the distortion of Fe—O octahedron structure due to oxygen vacancies or excess oxygen ions in the crystal structure of BiFeO3.
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Accepted manuscript online:
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PACS:
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77.22.Ch
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(Permittivity (dielectric function))
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61.72.J-
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(Point defects and defect clusters)
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61.66.Fn
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(Inorganic compounds)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60571063). |
Cite this article:
Lou Yan-Hui(娄艳辉), Song Gui-Lin(宋桂林), Chang Fang-Gao(常方高), and Wang Zhao-Kui(王照奎) Investigation on dependence of BiFeO3 dielectric property on oxygen content 2010 Chin. Phys. B 19 077702
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