High aspect-ratio (core/shell) platelets were precipitated from an aqueous gelatin solution, and the cross-sections of the platelets were examined by using low-resolution and high-resolution transmission electron microscopy. This provided direct microstructural evidence for the presence of {111}/{001}’/{111} rough-smooth twin structures in ionic solids. It was not found to be possible to detect the presence of secondary twin bands in the middle segment of doubly-twinned platelets. Also, the secondary twin bands in the top and bottom segments were not correlated.

S.Jagannathan, S.Chen, R.V.Mehta, R.Jagannathan: Physical Review B, 1996, 53[1], 9-11