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Vibrational and elastic properties of cubic and tetragonal phases of zirconia are discussed within the framework of quantitative lattice-dynamical treatments. The results reveal mechanical instabilities of both phases originating from the stresses inherent for these structures, and show that c-t and t-m transformations of ZrO₂ are driven by successive condensations of the zone-boundary modes whose softening is induced by the interatomic tensions.
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Mirgorodsky et al. (1997) studied this question.
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