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On the basis of proposed earlier model the eeects of applied hydro-static pressure on the physical properties of DKDP type crystals are studied. Within the cluster approximation for proton model the dielec-tric, thermal and elastic characteristics of considered crystals are calculated. Detailed numerical analysis of obtained results is performed. It is shown that under the proper choice of the theory parameters, a satisfactory description of experimental results for the pressure dependencies of spontaneous polarization, static dielectric permittivities and transition temperature is obtained. To explain the experimental determined behaviour of elastic constants the anharmonic eeects must be taken into account.

HYDROSTATIC PRESSURE INFLUENCE ON PHASE TRANSITION AND PHYSICAL PROPERTIES OF KD_{2}PO_{4}-TYPE FERROELECTRICS