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Abstract
Effect of hydrostatic pressure up to 400 Mpa on the electric permittivity in [NH2(CH3)2]3 Sb2Cl9 was studied. The transition temperature (T c ) was found to increase with increasing pressure up to 150 MPa, passed through a maximum and than decrease with increasing pressure. Unexpected nonlinear decreasing of T c with increasing pressure above 150 Mpa indicates the different mechanism of ferroelectric phase transition than that considered till now.