TGS铁电相变的时域方法研究

利用时域方法在 TGS 单晶居里点附近以±0.001℃的恒温精度研究了铁电相变的过程,观察到驰豫机构可分为晶格和电子云畸变、电畴运动、和自发极化电偶极矩的屏蔽电荷的激发三种成分.介电损耗在10~(-3)—10~3Hz 频程的峰值表明,在铁电相变过程中晶体和外界的能量交换主要来自屏蔽电荷的激发.

Research in TGS Ferroelectric Phase Transition by the Time—Domain Technique

The ferroelectric phase (FE) transition at the Curie point of TGS single crystal is studied by means of the time—domain technique with the temperature change correct within ±0.001℃.It is found that there exist three kinds of relaxation compo- nents in TGS phase transition,namely,the distortion of the lattice or the electric cloud, the motion of the electric domain,and the excitation of the shielding charges of the spon- taneous polarized electric dipole moment.The peaks of the dielectric loss in the frequen- cy region ranging from 10~(-3)to 10~3 Hz indicate that in the FE transition the excitation of the shielding charges is the main source of the energy exchange between the crystal and outside.