Abstract
Abstract Temperature T (30-150°C) and pressure p (0-6 kbar) dependence of the permittivity e and the spontaneous polarization Ps of PbFe1/2Nb1/2O3 ceramics prepared by the use of alkoxides are presented. The e has a broad maximum at the transition point Tt. The value of the exponent for the logarithmic plots of the reciprocal e versus the reduced temperature above Tt is 2.0, which is almost independent of p. As p increases, the Tt decreases with dTtldp = -3.7K/kbar and the maximum value of e decreases. The T and p dependence of e and Ps are explained by a phenomenological theory.
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