Abstract
A compressible pseudo-spin Ising model hamiltonian is used to calculate the pressure-temperature phase diagram of quasi-one-dimensional hydrogen-bonded ferroelectric crystals such as CsD 2PO 4. We assume strong effective interactions, which are treated exactly, along chains, and weak volume dependent interactions, which are treated in the mean field approximation, between chains. In agreement with the experimental findings, the phase diagram exhibits a triple point and transition lines between ferroelectric, antiferroelectric, and paraelectric phases. However, the results suggest that the Ising model may be too simple to account for the detailed form of the phase diagram of CsD 2PO 4.
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