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We propose a two-sublattice proton ordering model for thequasione-dimensional CsH$_2$PO$_4$ ferroelectric with hydrogen bonds, whichtakes into account linear on lattice strains $u_1$, $u_2$, $u_3$ and $u_5$contribution to the energy of proton subsystem. The model also takes intoaccount the dependence of effective dipole moments of pseudospins on the orderparameters, which enables one to agree the effective dipole moments inparaelectric and ferroelectric phases. Within this model in two-particlecluster approximation on short-range interactions and in the mean fieldapproximation on long-range interactions, there is investigated the behaviourof spontaneous polarization, longitudinal dielectric permittivity and molarheat capacity under the action of hydrostatic pressure and longitudinalelectric field. The phase transition into antiferroelectric phase under highpressures is explained. The character of smearing of theparaelectric-ferroelectric phase transition as well as suppression of theantiferroelectric phase at the presence of electric field is studied.

condensed matter physics

Effect of hydrostatic pressure and longitudinal electric field on phase  transitions and thermodynamic characteristics of quasione-dimensional  CsH$_2$PO$_4$ ferroelectric