The inner-strain tensor describing the departure from uniform strain within the unit cell of a stressed crystal has been calculated for the Al 2 O 3 corundum structure from the parameters of the lattice dynamic model of Kappus (1975) using a technique based on the long-wave approach. The departure from uniform strain is significant particularly for the oxygen atoms. The major components of the tensor for the oxygen atoms approximate to those obtained using a pseudo-HCP model of the anion structure.
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Sean D Devine (1983) studied this question.
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