Abstract
The monoclinic (space group C2/m) superstructure of V14O6, which is formed in the atom-vacancy ordering of the tetragonal solid solution of oxygen in vanadium, is studied by the methods of x-ray diffraction and symmetry analysis. It has been found that the channel of the order-disorder phase transition attributed to the formation of the monoclinic suboxide V14O6 includes six superstructure vectors belonging to three non-Lifshitz stars {k 1−1}, {k 1−2}, and {k 1–3} of one type {k 1}. The distribution function of the O atoms in the V14O6 monoclinic superstructure has been calculated. It has been shown that the displacements of V atoms distort the body-centered tetragonal metal sublattice, thus preparing the formation of the fcc sublattice and the transition from the suboxide V14O6 to the cubic vanadium monoxide with the B1 structure.
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Original Russian Text © A.I. Gusev, D.A. Davydov, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 86, No. 10, pp. 746–751.
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Gusev, A.I., Davydov, D.A. Monoclinic superstructure V14O6 of the tetragonal solid solution of oxygen in vanadium. Jetp Lett. 86, 657–661 (2008). https://doi.org/10.1134/S0021364007220092
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DOI: https://doi.org/10.1134/S0021364007220092