Structures of the ReO₃-type with recurrent dislocations of atoms: `homologous series' of molybdenum and tungsten oxides

Abstract

The geometrical properties of structures of the ReO3-type showing recurrent dislocations of atoms, analogous to those present in MosO~ 3, Mo90~ and W20Oss, are discussed. Two of the hypothetical atomic arrangements thus derived have been found to correspond to recently prepared molybdenum tungsten oxides (1V[o,W)10029 and (Mo,W)nOz2. These compounds and the aforementioned molybdenum oxides are members of a 'homologous series', MenOan-~, based on a common structural principle. There is almost complete agreement between the experimentally derived structures of these homologues and the corresponding ideal structures. The same is also true for W20Oss, the only hitherto known representative of the series MenOan-2.