Electron microscopic study of polymorphism and defects in AgBiSe2 and AgBiS2

Abstract The phase transformations of the ternary compounds AgBiSe 2 and AgBiS 2 are studied by means of electron microscopy and electron diffraction methods. In accordance with the results of other investigators two phase transitions are observed upon heating above room temperature. The transition from the high to the intermediate temperature phase is of the order- disorder type and is accompanied by the formation of a domain structure exhibiting orientation variants. A particular configuration of striations in each domain is attributed to ordering of APBs formed between translation variants.