Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen. XXXIV. Fehlgeordnete Strukturen mit Großen Blöcken im System Nb2O5/WO3 — Elektronenmikroskopische Untersuchung

Contributions to the Investigation of Inorganic Non-stoichiometric Compounds. XXXIV. Disordered Structures Consisting of Large Blocks in the System Nb₂O₅/WO₃. An Electronmicroscopical Investigation The real structures of samples which have been prepared by quenching procedures using the composition Nb₂O₅: WO₃ = 10:11 are in most cases heavily disordered; some areas show extremly large blocks. The electron microscopic investigation revealed that the blocks consist of [n × m] M? O octahedra and have edge lengths of n = 5 to 14 and of m = 5 to 13 and in one case we even found [n × m] = [5 × 32]. In comparison, samples that were heated below the melting point for a longer time, showed a less disordered structure. Block sizes of [5 × 6] to [5 × 9] in a matrix of [5 × 5] blocks could be observed.