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Iso-Structural Phase Transitions in BiFeO3

Authors

  • James F. Scott

    Corresponding author
    1. Quantum Matter Group, Cavendish Laboratory Physics Department Cambridge University Cambridge CB3 0HE (UK)
    • Quantum Matter Group, Cavendish Laboratory Physics Department Cambridge University Cambridge CB3 0HE (UK).
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Abstract

This essay discusses recent work on bismuth ferrite, which reveals theoretically and experimentally a phase transition under stress that does not change symmetry but changes the c/a lattice constant ratio. As shown by Ishibashi, such transitions must be discontinuous and are described by free energies eighth-order in polarization P. Such a predicted two-step change in P is also known in potassium nitrate films.

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