Relaxation of 90° Domain Walls of BaTiO3 and Their Equation of Motion

摘要: The motion of 90° walls and wedge domains in BaTiO 3 single crystals under ac-fields ranged from 50 c/s to 200 Kc/s has been observed by the use stroboscopic illumination with short flash, which enables measurement displacement a desired phase field. relaxation found occur present range frequency. position wall (wedge) plotted against voltage shows hystesis loop, deforms as frequency increases. Several other aspects domain have studies function An equation is proposed: \begin{aligned} M\ddot{x}+\beta\dot{x}+c(x-p)+A\frac{\pi}{u}\sin\frac{\pi(x-p)}{u}{=}BV_{0}\sin\omega t. \end{aligned} third term due bound charge on surface crystal or compensating it. fourth reflects periodic potential for lattice defects. Most given shown be described equatio...