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Heat Capacity Response of Relaxor Ferroelectrics Near the Morphotropic Phase Boundary

The influence of the electric bias field on the sequence of monoclinic phase transitions between the tetragonal and rhombohedral phases was studied by heat capacity measurements in PMN 1 − x PT x single crystal with x = 0.295. It is shown that besides the cubic to tetragonal (C-T) phase transition also tetragonal to monoclic C (T-M C ) phase transition exhibit a critical point at certain critical bias field value, thus terminating a line of first order transitions. It is shown by field cooled and zero-field cooled polarization experiments that similar critical point also exists in 9/65/35 PLZT ceramics.