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Applied Physics Letters / Volume 84 / Issue 10 / DIELECTRICS AND FERROELECTRICITY

Appl. Phys. Lett. 84, 1731 (2004); http://dx.doi.org/10.1063/1.1667612 (3 pages)

Room-temperature saturated ferroelectric polarization in BiFeO3 ceramics synthesized by rapid liquid phase sintering

Y. P. Wang, L. Zhou, M. F. Zhang, X. Y. Chen, J.-M. Liu, and Z. G. Liu

National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

(Received 5 June 2003; accepted 10 January 2004)

Single-phased ferroelectromagnet BiFeO3 ceramics with high resistivity were synthesized by a rapid liquid phase sintering technique. Saturated ferroelectric hysteresis loops were observed at room temperature in the ceramics sintered at 880 °C for 450 s. The spontaneous polarization, remnant polarization, and the coercive field are 8.9 μC/cm2, 4.0 μC/cm2, and 39 kV/cm, respectively, under an applied field of 100 kV/cm. It is proposed that the formation of Fe2+ and an oxygen deficiency leading to the higher leakage can be greatly suppressed by the very high heating rate, short sintering period, and liquid phase sintering technique. The latter was also found effective in increasing the density of the ceramics. The sintering technique developed in this work is expected to be useful in synthesizing other ceramics from multivalent or volatile starting materials. © 2004 American Institute of Physics.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

bismuth compounds, ferroelectric ceramics, sintering, coercive force, antiferromagnetic materials, dielectric hysteresis, dielectric polarisation, density

PACS

  • 77.22.Ej

    Polarization and depolarization

  • 77.80.Dj

    Domain structure; hysteresis

  • 77.84.-s

    Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials

  • 81.05.Je

    Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)

  • 75.50.Ee

    Antiferromagnetics

  • 75.50.Vv

    High coercivity materials

  • 81.20.Ev

    Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1667612

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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    V. R. Palkar, J. John, and R. Pinto, Appl. Phys. Lett. 80, 1628 (2002)APPLAB000080000009001628000001.

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    M. Mahesh Kumar, A. Srinivas, and S. V. Suryanarayana, J. Appl. Phys. 87, 855 (2000)JAPIAU000087000002000855000001.

    M. Mahesh Kumar, V. R. Palkar, K. Srinivas, and S. V. Suryanarayana, Appl. Phys. Lett. 76, 2764 (2000)APPLAB000076000019002764000001.


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