Rate-dependent model for phase transitions in perovskite type single crystals
The paper presents a rate-dependent thenno-electro-mechanical free energy model for perovskite type single crystal materials. The proposed free energy model has seven energy wells corresponding to six different types of ferroelectric variants and one paraelectric cubic phase in the ten-dimensional space of electric displacement vector, strain tensor and temperature. The free energy potential is combined with thermal activation theory, thus capturing ratedependent effects of the materials. The thermodynamic Clausius-Clapeyron relation is derived and various interesting features of the materials, such as double polarization hysteresis loops near Curie point, rate-dependent hysteresis loops, and variation of spontaneous polarization over temperature, are calculated and discussed.
Sang-Joo Kim
Department of Mechanical and Information Engineering, University of Seoul, Seoul 130-743, Korea
国际会议
The 5th International Conference on Nonlinear Mechanics(第五届国际非线性力学会议)
上海
英文
1577-1583
2007-06-11（万方平台首次上网日期，不代表论文的发表时间）