The fine structures of dislocations with (100) Burgers vectors in YBa2Cu3O7-δ ceramics were characterized by transmission electron microscopy after various thermomechanical treatments. The dissociation widths were larger after high-temperature treatments and it was found that, even at room temperature, dissociation of dislocations was associated with a local non-stoichiometry. The dissociation reaction could be written as

<100>  1/6<301> + 1/6<30¯1>

on the (001) plane. This involved the insertion of a CuO layer into the matrix at the dislocation core.

On the Dissociation of Dislocations in YBa2Cu3O7-δ. J.Rabier, P.D.Tall, M.F.Denanot: Philosophical Magazine A, 1993, 67[4], 1021-35