Materials Science Forum, cilt.294-296, ss.191-194, 1999 (SCI-Expanded)
Single TlBiS2 crystals are studied by transmission electron microscopy. It is found that the compound has a very long period superstructure -in addition to an already known one due to ordering of Tl and Bi atoms on separate (111)R planes- which rises by periodic ordering of (114)R interfaces in the basic superstructure matrix. Models for this superstructure, which is probably related to composition modulation are proposed. © 1999 Trans Tech Publications.