The Ferroic Phase Transitions of BiFeO3

Authors

  • Sverre M. Selbach,

    1. Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) 7491 Trondheim (Norway)
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  • Thomas Tybell,

    1. Department of Electronics and Telecommunications Norwegian University of Science and Technology (NTNU) 7491 Trondheim (Norway)
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  • Mari-Ann Einarsrud,

    1. Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) 7491 Trondheim (Norway)
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  • Tor Grande

    Corresponding author
    1. Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) 7491 Trondheim (Norway)
    • Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) 7491 Trondheim (Norway).
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  • Elin Nilsen and Espen Rudberg at NTNU are acknowledged for assisting HTXRD and conductivity measurements, respectively. This work was supported by the Norwegian University of Science and Technology and the Research Council of Norway (NANOMAT, grants 158518/431, 140553/I30, and 162874/V00). Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

original image

BiFeO3 displays an abrupt first order transition from the polar structure R3c to centrosymmetric equation image at TC = 830 °C. The ferroelectric transition is associated with abrupt changes in polar cation displacements and a large discontinuous volume. A continuous volume expansion occurs across the second order antiferromagnetic transition at TN = 370 °C. Electronic conductivity anomalies are associated with both phase transitions.

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