Microstructural defects in the melt-textured superconductor were studied by means of the transmission electron microscopy of samples in which the electron beam was parallel to the a-b plane. A planar defect with a highly disordered atomic arrangement within it was observed. A large density of defects (109 to 1010/cm2), in the form of dislocations and stacking faults, was found. Also observed were [001]-type edge dislocations, and a localized crystal-plane distortion with a surrounding strain field region. In addition, stacking faults which were identified as being the Cu4Ba2YO8 phase were also found.

J.A.Xia, P.R.Munroe, R.K.Wang, H.T.Ren, Y.Zhao, S.X.Dou: Physica C, 1995, 241[1-2] 142-50