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- W2022151958 abstract "Es gelang, das Existenzgebiet der Blockstrukturen im System Nb2O5/WO3 erheblich zu erweitern. Durch Substitution von Nb durch W bei konstantem Verhältnis O/∑M (M Nb, W) erhält man, von den bekannten Phasen Nb2O5:WO3 = 6:1; 7:3; 8:5 und 9:8 ausgehend, Mischkristallreihen, deren metastabile Oxydationsprodukte ebenfalls Blockstrukturen besitzen. Gegenüber den Mischkristallen mit den Strukturen der Ausgangsphasen, d. h. mit sogenannten Blöcken aus [3 × 4], [4 × 4], [4 × 5] und [5 × 5] MO-Oktaedern, sind in den Oxydationsprodukten Kantenverknüpfungen der Oktaeder z. Tl. in Spitzenverknüpfungen übergegangen, so daß Blöcke mit der doppelten Zahl von Oktaedern gebildet werden konnten. Reihen dieser großen Blöcke mit z. B. [4 × 6] oder [4 × 8] Oktaedern wechseln nichtperiodisch mit Reihen kleinerer Blöcke der ursprünglichen Größe ab. Einzelheiten der stark gestörten Strukturen ließen sich nur mit Hilfe der hochauflösenden Elektronenmikroskopie erkennen. Contributions to the Investigation of Inorganic Non-stoichiometric Compounds. XXII. New Metastable Block Structures in the System Nb2O5/WO3, Electron Optical Investigation We succeeded in considerably expanding the region of existence of block structures. By substituting W for Nb, while the ratio O/∑M (M Nb, W) is kept constant, and starting from the known phases Nb2O5: WO3 = 6:1, 7:3, 8:5 and 9:8 one obtains series of solid solutions whose metastable products of oxidation have block structures too. In contrast to the solid solutions which have the structures of the starting phases i. e. with socalled blocks of [3 × 4], [4 × 4], [4 × 5] and [5 × 5] MO-octahedra, the products of the oxidation have structures in which some edge sharing octahedra changed their connections to become octahedra sharing corners thus opening up the possibility for the formation of blocks with twice the number of octahedra as before. Rows of these large blocks with e. g. [4 × 6] or [4 × 8] octahedra alternate nonperiodically with rows of smaller blocks of the initial size. Details of these heavily disordered structures could only be discerned with the help of high resolution electron microscopy." @default.
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- W2022151958 date "1983-08-01" @default.
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- W2022151958 title "Beitr�ge zur Untersuchung anorganischer nichtst�chiometrischer Verbindungen. XXII. Neue metastabile Blockstrukturen im System Nb2O5/WO3 Elektronenoptische Untersuchung" @default.
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- W2022151958 doi "https://doi.org/10.1002/zaac.19835030817" @default.
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