The results of the joint lattice‐dynamical model treatment of the vibrational and elastic properties of the cotunnite‐type zirconia and hafnia are presented. The model is capable of reproducing the frequencies of the Raman‐active vibrations, and provides their symmetry assignment. Also it predicts the position of the infrared‐active bands. The model successfully describes the elastic properties of the low‐pressure polymorphs, but could not reproduce the bulk modulus of OII‐ZrO 2 of 332 GPa obtained from a volume‐pressure dependence. The current results give an estimate of the bulk modulus of 254 GPa.
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Mirgorodsky et al. (1999) studied this question.
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