The boundaries in polycrystalline melt-textured samples which had been prepared by using the liquid phase removal method were analyzed by means of transmission electron microscopy. The samples contained a number of grains which were separated by high-angle grain boundaries that were up to several mm in length. The results of the transmission electron microscopic studies showed that the large misorientation angles of these boundaries were maintained over long distances by intra-grain features such as platelet boundaries and low-angle grain boundaries. Measurements which were performed on adjacent platelets, as well as at locations within single grains, showed that the presence of these boundaries maintained the misorientation of the large-angle grain boundaries to within 6º. This indicated that high-angle grain boundaries in these samples did not dissociate into low-angle grain boundaries.

Measurements of Misorientation Angles Over a Large Distance in Strongly Coupled Grain Boundaries. M.Mironova, G.Du, K.Salama: IEEE Transactions on Applied Superconductivity, 1999, 9[2], 1630-8