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Contributions to the Investigation of Inorganic Non‐stoichiometric Compounds. XXXVI. Tungsten‐rich Solid Solution Series of (Nb, W)O x Phases Having Block Structures – Preparation by Chemical Transport
Author(s) -
Hussain A.,
Gruehn R.
Publication year - 1989
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19895710110
Subject(s) - solid solution , tungsten , stoichiometry , isothermal process , block (permutation group theory) , chemistry , octahedron , series (stratigraphy) , chemical formula , natural bond orbital , crystallography , inorganic chemistry , materials science , analytical chemistry (journal) , crystal structure , thermodynamics , molecule , organic chemistry , paleontology , physics , geometry , mathematics , biology
Attempts have been made to prepare crystals of solid solution series having block structures with building elements of [3×4], [4×4], [4×5], and [5×5] octahedra in the system Nb 2 O 5 /WO 3 /NbO 2 by chemical transport reactions with various transport agents. Crystals of about 6 mm in length of these compounds, however, have been prepared by a nearly isothermal chemical transport with HgCl 2 as a mineralizer. The compositional limit of the four solid solution series has been somewhat extended compared to reported values.