Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen. XXVI. Darstellung und elektronenmikroskopische Untersuchung von V16W9O65

Contributions to the Investigation of Inorganic Non-Stoichiometric Compounds. XXVI. Preparation and Electron Optical Investigation of V₁₆W₉O₆₅ The mixed vanadium-tungsten oxide with the composition V₁₆W₉O₆₅ (V_0.64W_0.36O_2.60) was prepared by chemical transport reactions. The dimensions of the tetragonal unit cell are a = 25.074 Å; c = 3,714 Å, determined by the X-ray-Guinier method. The probable space group is 14/mmm. The electron microscopical investigation directly reveals the block structure of the new compound. The blocks are made up of [5 × 5 × ∞] corner sharing M-O-octahedra. Other unusual block sizes are observed as defects. The blocks are connected by common corners like in the related compound (V_0.65W_0.35)₂O₅ with [4 × 4 × ∞] blocks.