Inter-growth structures which occurred in these ceramic superconductors were studied by means of transmission electron microscopy. It was noted that there were at least 2 types of inter-growth structure. It was shown that 2 immobile dislocations could be created by a suitable combination of inter-growth structures.

C.C.Lam, S.D.Wang, H.M.Shao, G.J.Shen, J.C.L.Chow, P.C.W.Fung, S.L.Ho, H.Y.Lai, K.C.Hung: Physica C, 1995, 247[1-2], 43-54