The angular distributions of high-angle boundaries in composite tapes were studied by means of electron microscopy. In the case of Cu3Bi2Ca2Sr2O10, the distributions were random whereas, in the case of Bi2Cu2Sr2CaO8, there was a high incidence of special boundary misorientations. The preferred orientations in Bi2Cu2Sr2CaO8, which were analyzed for [001] and [100] rotations, agreed well with calculated lattice coincidences which were based upon the constrained coincidence site lattice model. They were attributed to the reorientation of neighboring grains during partial melting.

Y.Zhu, M.Suenaga, R.L.Sabatini: Applied Physics Letters, 1994, 65[14], 1832-4