The tetragonal distortion of octahedral (ML6) systems having two-fold orbital degeneracy is discussed on a model which takes into account covalency and the essential features of the Jahn-Teller effects. Theoretically both elongation and compression along the tetragonal axis are possible, depending on the sign of the coefficients involved in the first and the second-order terms. Covalency effects seem to influence this fact. A qualitative discussion of these results is presented.
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Pryce et al. (1965) studied this question.
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