Abstract
The electrostrictive corrections have been made to a previous theory based on the pseudo one-dimensional Ishing model. The corrected results explain well the dielectric and the heat-capacity data of CsD 2 PO 4 (d-CDP) both in the para- and ferroelectric phases even without the proton-tunnelling terms, but they are not so successful in the case of CsH 2 PO 4 (CDP). The ratio of the effective dipole moments which indicates the strength of the effect of proton-tunnelling [Levstik et al .: J. Phys. C 19 (1986) L25] is evaluated as µ e /µ p = 1.2 for CDP. This value suggests that, in CDP, the tunnelling-effect cannot be neglected.
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