Direct observation of monoclinic ferroelectric phase and domain switching process in(K0.25Na0.75)NbO3 single crystals

作者：Deng Hao^*; Zhang Haiwu; Zhao Xiangyong; Chen Chao; Wang Xi'an; Li Xiaobing; Lin Di; Ren Bo; Jiao Jie; Luo Haosu

来源：CrystEngComm, 2015, 17(14): 2872-2877.

DOI：10.1039/c4ce02199a

In situ observations of the phase symmetry and domain evolution of (K0.25Na0.75)NbO3 single crystals under bipolar electric fields have been performed for both pseudocubic (110) and (001) orientations using polarized light microscopy and X-ray diffraction. The macroscopic symmetry was identified to be a monoclinic C type phase with the spontaneous polarization direction close to < 054 >. The electric field-driven domain morphology and evolution model were also presented. It was found that, under an antiparallel electric field, the approximately 180 degrees domain switching process in a pseudocubic (101) sample consists of three steps: two similar to 60 degrees domain switching and a similar to 90 degrees domain switching, and the similar to 90 degrees domain switching process in the pseudocubic (001) sample is composed of two similar to 60 degrees switching steps.

• 出版日期2015
• 单位中国科学院大学; 中国科学院上海硅酸盐研究所