title: Electric-field-induced phase transitions of (1-x)PbMg(1/3)Nb(2/3)O(3)-xPbTiO(3) crystals studied by optical methods.
abstract: The phase transitions of as-grown (1-x)PbMg(1/3)Nb(2/3)O(3)-xPbTiO(3) (PMN-xPT) crystals with PT compositions of x = 0.31 and 0.38 under a dc electric field were observed in a polarization microscope. The optical transmissions of the crystals under dc electric fields were measured in the wavelength region around their optical absorption edges. The band gaps of the orthorhombic and tetragonal phases under the applied electric field were obtained. By combining both of the optical methods, the phase transition from the tetragonal to the orthorhombic phase was observed in PMN-0.38PT crystals when the electric field along the [110](cub) direction reaches up to 300 V mm(-1). Whereas the PMN-0.31PT crystals undergo the pseudo-phase-transition under a dc electric field along the [110](cub) direction. The pseudo-phase-transition possibly stems from the reorientation and growth of microdomains in PMN-0.31PT crystals.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, People's Republic of China. Graduate University of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Li
authors.forename: Feifei
authors.initials: F
authors.lastname: Wang
authors.forename: Yanting
authors.initials: Y
authors.lastname: Lin
authors.forename: Linhua
authors.initials: L
authors.lastname: Liu
authors.forename: Xiangyong
authors.initials: X
authors.lastname: Zhao
authors.forename: Haosu
authors.initials: H
authors.lastname: Luo
authors.forename: Di
authors.initials: D
authors.lastname: Lin