Abstract
The effect of a constant electric field (0 < E < 5 kV/cm) on the optical properties of PbZn1/3Nb2/3O3−xPbTiO3 (PZN-xPT) crystals with x = 7 and 9% has been analyzed. It has been shown that, at temperatures close to the temperature of the transition from the rhombohedral [R(X)] phase to the tetragonal (T) phase, two induced phase transitions are observed in the electric field, which are associated with the appearance of new intermediate phases Ma and Mc [R(X)-Ma-Mc-T]. Correlation between these two transitions and the PbTiO3 content x has been found. The E-T phase diagrams have been obtained. The Mc phase in PZN-9PT crystals is found to remain the ground state after the removal of the electric field, whereas the Mc phase in PZN-7PT crystals is metastable and is transformed into the Ma phase after the removal of the electric field.
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