在外电场作用下BaTiO_3单晶中铁电畴极化反转的透射电镜原位研究

In situ transmission electron microscopy study of domain switching in BaTiO_3 single crystal under external electric fields

通过在样品表面施加电场,利用透射电子显微镜原位观察和研究了BaTiO3单晶中铁电畴的极化反转过程。结果表明,在外加电场作用下,铁电畴发生重新取向,其极化方向逐渐向着与电场方向平行的方向转变,当撤去电场后,又趋向于恢复到初始状态。

In situ transmission electron microscopy （TEM） techniques have been used to investigate domain switching in BaTiO3 single crystal under an external static electric field on a homemade special TEM stage. A domain switching process during applying a static electric field was clearly observed. The initial domains reoriented gradually and the polarizations inclined to switch to the direction along the electric field. The domain boundaries switched from [ 101 ] to [101 ]. After the electric field was removed, the domains recovered but did not revert to their original status completely. At the same time, the fracture was induced in the crystal due to the strain caused by reorientation of 90° domains.