Slater s theory of the dielectric constant in BaTiQ3 has been extended by treating the ionic polarizability quantum mechanically instead of classically. This leads to an expression for the dielectric constant which is good at all temperatures and shows a deviation from the Curie-gneiss law at low temperatures. The theory is applied to SrTiQ3 and to KTaQ3 above its transition at 13.2'K.
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