Analysis of the structure of an amorphous sediment obtained upon decomposition of potassium oxofluroniobate in water |
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Authors: | K. B. Aleinikova E. N. Zinchenko A. V. Arakcheeva V. V. Grinevich |
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Affiliation: | (1) Voronezh State University, Universitetskaya pl. 1, Voronezh, 394893, Russia;(2) Baikov Institute of Metallurgy, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 117334, Russia |
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Abstract: | An amorphous sediment was prepared by the decomposition of potassium oxofluoroniobate K2 ? x Nb4O3(O, F)3F in water. For this sediment, the atomic radial distribution function was analyzed with the use of a fragment model, which allows one to interpret expanded coordination spheres as being formed by first several strongest diffusion maxima. These spheres carry the most reliable information on the structure. It is shown that the amorphous sediment consists of the randomly packed Nb(O,F)6-octahedra with interatomic distances close to those observed in the ordered region in the N-Nb2O5 structure. During decomposition in water, the initial K2 ? x Nb4O3(O, F)3F phase loses KF-layers, whereas Nb6 clusters with metal bonds are destroyed. |
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