硫酸三甘肽(TGS)晶体中电畴的观察

TGS晶体是一种铁电晶体,是现阶段制备热释电探测器件的一种较好的材料。 铁电体的一个重要特性,是在一定的温度范围内具有自发电极化强度。自发极化是被晶体中存在的电偶极矩所决定的,在晶体中有这样一些区域,其中电偶极矩的取向一致,具有相同的自发电极化方向,这些区域就称为电畴。我们观察电畴的目的,在于找出晶体的电畴结构和宏观性质之间的联系。

OBSERVATION OF THE FERROELECTRIC DOMAIN IN SINGLE CRYSTALS OF TRIGLYCINE SULPHATE

The domain structure of pure and doped TGS crystals has been investigated on cleft (010) surface by both the etching technique and the powder-pattern technique. It was shown in our experiments that the direction of polarization is the [010] axis and the domains are antiparallel 180° domains with walls parallel to the [010] axis. Both of these two techniques could delineate and discriminate the domains in pure crystals and the results from them are in good agreement.We found in our experiments a new colloidal solution, a few drops of which on the cleft (010) surface of pure crystals can immediately delineate and discriminate their domains with high resolution and good reliability.