Thermodynamics properties of RbH(2)AsO(4)
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Calorimetric and dielectric measurements have been made on RbH(2)AsO(4), in the vicinity of the temperature of the ferroelectric transition 109.75 K. The transition is found to be first order with latent heat 255 +/- 5 J/moule. The total transition entropy is found to be 0.50R. The Curie constant is found to be 223 K. these results differ considerably from the predictions of the conventional static hydrogen-bond-occupational model, a fact which can be interpreted as demonstrating that dynamic effects are more important in RbH(2)AsO(4) than is KH(2)AsO(4).