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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J. F. Scott (2010) studied this question.
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