The room-temperature forms of these crystals were studied by means of high-resolution electron microscopy. Some contrast effects, in high-resolution images, which were specific to materials which consisted of molecules with a spherical shell shape, were noted. It was found that the observed defect configurations were very similar to those in face-centered cubic metals and alloys with a low stacking-fault energy. Lattice relaxation at twin interfaces, surfaces and stacking faults, as well as surface reconstruction, were also investigated.

S.Muto, G.Van Tendeloo, S.Amelinckx: Philosophical Magazine B, 1993, 67[4], 443-63