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The contributions of monopoles, dipoles and quadrupoles to the electric field gradient at B sites of normal cubic spinels, ZnAl 2 O 4 , ZnFe 2 O 4 , CoAl 2 O 4 , MgAl 2 O 4 , CdFe 2 O 4 and WNa 2 O 4 have been calculated. From a comparison with experimental results, a coherent range of variation of the dipole polarizability of the oxygen ion, between 0.5 and 1.5 AA 3 , is determined. The variation seems to be due to an evolution of the dipole polarizability with the ionic radius of the oxygen ion. Effects of covalency are also discussed.
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Kirsch et al. (1974) studied this question.
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