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James F. Scott Iso-Structural Phase Transitions in BiFeO3 Advanced Materials 22

Article first published online: 18 MAR 2010 | DOI: 10.1002/adma.200904229

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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