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Dielectric and magnetic properties in Ta-substituted BiFeO3 ceramics

Published online by Cambridge University Press:  31 January 2011

Youn-Ki Jun
Affiliation:
Department of Materials Science and Engineering and Nano Systems Institute, Seoul National University, Seoul 151-742, Korea
Sung Bo Lee
Affiliation:
Department of Materials Science and Engineering and Nano Systems Institute, Seoul National University, Seoul 151-742, Korea
Miyoung Kim
Affiliation:
Department of Materials Science and Engineering and Nano Systems Institute, Seoul National University, Seoul 151-742, Korea
Seong-Hyeon Hong*
Affiliation:
Department of Materials Science and Engineering and Nano Systems Institute, Seoul National University, Seoul 151-742, Korea
Jae Wook Kim
Affiliation:
School of Physics, Seoul National University, Seoul 151-742, Korea
Kee Hoon Kim
Affiliation:
School of Physics, Seoul National University, Seoul 151-742, Korea
*
a)Address all correspondence to this author. e-mail: shhong@snu.ac.kr
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Abstract

The dielectric and magnetic properties were investigated in Ta-substituted BiFeO3 polycrystalline ceramics synthesized by a solid-state reaction. The Ta substitution decreased the grain size by two orders of magnitude compared with that of unsubstituted ceramics and increased the electrical resistivity by 6 orders of magnitude. The high resistivity and low dielectric loss allowed the dielectric constant to be determined at room temperature. The magnetic hysteresis loops were observed in the Ta-substituted BiFeO3, and the appearance of ferromagnetism was closely associated with the distortion of the oxygen octahedra by the Ta substitution. The coupling between the electric and magnetic dipoles was examined by determining the changes of the dielectric constant with the external magnetic field.

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Articles
Copyright
Copyright © Materials Research Society 2007

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References

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