Summary
The conventional shell model, in which the short-range forces between the ions in a crystal are assumed to act between shells only, can give a good account of the elastic, dielectric and phonon properties of strontium titanate at room temperature. In this paper the modifications that are necessary in order to explain the strong temperature dependence of the elastic constants, static permittivity and frequency of the soft mode in the cubic phase of strontium titanate are considered.
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In honour of Prof. Gianfranco Chiarotti on the occasion of his 70th birthday.
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Jacobs, P.W.M. A temperature-dependent shell model for strontium titanate. Nouv Cim D 20, 1187–1192 (1998). https://doi.org/10.1007/BF03185529
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DOI: https://doi.org/10.1007/BF03185529