Temperature-dependent phase transitions in Pb(Zn1/3Nb2/3)0.93Ti0.07O3 crystal

Abstract

The temperature dependent phase transitions in an unpoled (001)-cut Pb(Zn 1/3 Nb 2/3 ) 0.93 Ti 0.07 O 3 single crystal have been investigated by dielectric permittivity and polarizing microscopy. The crystal at room temperature has a dominant rhombohedral phase mixed with unknown domains. The unknown phase domains transform to coexistence of tetragonal/monoclinic symmetries near 350 K. As temperature increases, the tetragonal/monoclinic domains increase and reach saturation near 365 K. These phase transformations in the region of 350–365 K are responsible for the dielectric anomaly near 355 K. Most of monoclinic domains start to transform to the tetragonal domains near 422 K. The whole crystal becomes cubic phase at 432 K.