Crystallographic Features of Ferroelectric Domain Structures in (Sr_(1-x)Ba_x)Bi_2Ta_2O_9

摘要

The crystallographic features of the ferroelectric domain structures in (Sr_(1-x)Ba_x)Bi_2Ta_2O_9 single crystals have been examined by transmission electron microscopy. The unique 90 deg domain structures were found in these single crystals. In SrBi_2Ta_2O_9 with x = 0, particularly the majority domains with the + -[110]_t polarization vectors in the tetragonal notation are divided by the minority ones with the + - [1 1 0]_t vectors, which were observed as a curved-line contrast in dark field images.