摘要
利用Ｌａｎｄａｕ－Ｇｉｎｚｂｕｒｇ－Ｄｅｖｏｎｓｈｉｒｅ的自由能函数和点群４／ｍｍｍ的对称性质给出了钛酸铋的弹性吉布斯自由能的表达式，并确定了能量函数表达式的系数，计算出零应力条件下Ｂｉ４Ｔｉ３Ｏ１２晶体的自发应变、自发极化、介电常数与温度的关系．
The expansion formula of elastic Gibbs free energy of bismuth titanate has been derived by using the free energy function of Landau-Ginzburg-Devonshire and symmetrical properties of point group 4/ mmm , and the coefficients of expansion formula of energy function have also been determined. The temperature dependences of spontaneous strain, spontaneous polorization and dielectric constant under the zero stress have been calculated.
出处
《湖北大学学报（自然科学版）》
CAS
1997年第3期227-232,共6页
Journal of Hubei University：Natural Science
基金
湖北省科委自然科学基金
关键词
钛酸铋
唯象理论
介电常数
自由能
热力学
Bismuth titanate
Phenomenal theory
Spontaneous strain
Spontaneous polarization
Dielectric constant
