Field-Induced Domain Reorientation and Polarization Rotation of 〈110〉 Oriented Pb（Mg1/3Nb2/3） O3-PbTiO3 Single Crystals  

作　　者：陈克丕 张孝文 方菲 

机构地区：[1]Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education), North China Electric Power University, Beijing 102206 [2]State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 [3]Department of Engineering Mechanics, Tsinghua University, Beijing100084

出　　处：《Chinese Physics Letters》2006年第6期1596-1599,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 50432030.

摘　　要：Polarization hysteresis loops, x-ray diffraction and temperature dependent dielectric constant under different electric fields for 〈110〉 oriented 0.7 PMN-0.3 PT crystals are measured. The field-induced phase transition and the process of depolarization are discussed. The results show that with the electric field E increasing, the singlecrystal form changes from the relaxor state of rhombohedral to normal rhombohedral, then to a monoclinic state via polar-axis reorientation and polarization rotation. Orthorhombic phase may present when E≥ 10 k V, but it is an unstable form after E removal. The depolarization process is not just the reversal of the polarization process. It is noticed that only the temperature-dependent dielectric behaviour is not enough to judge the processes of the E-field induced phase transition.Polarization hysteresis loops, x-ray diffraction and temperature dependent dielectric constant under different electric fields for 〈110〉 oriented 0.7 PMN-0.3 PT crystals are measured. The field-induced phase transition and the process of depolarization are discussed. The results show that with the electric field E increasing, the singlecrystal form changes from the relaxor state of rhombohedral to normal rhombohedral, then to a monoclinic state via polar-axis reorientation and polarization rotation. Orthorhombic phase may present when E≥ 10 k V, but it is an unstable form after E removal. The depolarization process is not just the reversal of the polarization process. It is noticed that only the temperature-dependent dielectric behaviour is not enough to judge the processes of the E-field induced phase transition.

分 类 号：O7[理学—晶体学]