Dispersion relations of phonons propagating along three symmetry directions in calcium oxide have been measured by the triple axis neutron spectrometer method. The experimental results have been interpreted in terms of a shell model showing that the electronic polarizability of both ions must be taken into consideration. The parameters of the most satisfactory model obtained by least squares fitting to neutron, elastic and dielectric data have been used to calculate the frequency distribution at room temperature. The results of the analysis are compared with those of similar analyses of the related crystal, magnesium oxide.
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Saunderson et al. (1971) studied this question.
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