Core structures of <001> {110} edge dislocations in BaTiO₃

The core structures of two types of <001> {110} edge dislocations in BaTiO₃ have been observed and investigated at the atomic scale by using aberration-corrected transmission electron microscopy (AC-TEM). The edge dislocations are both dissociated into two collinear partial edge dislocations bounding a complex stacking fault (SF). While the partial dislocations have the same Burgers vector, 1 2 [001], the dissociation planes are different for the two types of edge dislocations, with one at the BaO plane and the other at the TiO₂ plane. The SF energy has been estimated by measuring the SF width.