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Mechanochemical synthesis of crystalline compounds in the Bi-V-O system

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Abstract

The phase composition of crystalline mechanochemical synthesis products in the Bi2O3-V2O5 system is determined by x-ray diffraction. The phases identified are sillenite, clinobisvanite, a fluorite phase, the high-temperature form of the Aurivillius phase γ-Bi2VO5.5-x , and new, metastable tetragonal fluorite-like solid solutions. The same compounds are obtained at other Bi : V ratios using Bi2O4 and VO2 as starting reagents. Structural analysis of the synthesized compounds reveals high vacancy concentrations and substitutional disordering. The room-temperature ESR spectra of the samples show V4+ signals at g ≃ 2 and 4. The phase transitions characteristic of clinobisvanite and γ-Bi2VO5.5 -x are not detected by thermal analysis, in line with the structural data. Mechanical activation of high-purity α-Bi2O3 converts it into the β form; in the presence of impurities, the resulting phases have fluorite or slightly distorted fluorite-like structure.

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Translated from Neorganicheskie Materialy, Vol. 41, No. 2, 2005, pp. 201–209.

Original Russian Text Copyright © 2005 by Zyryanov.

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Zyryanov, V.V. Mechanochemical synthesis of crystalline compounds in the Bi-V-O system. Inorg Mater 41, 156–163 (2005). https://doi.org/10.1007/s10789-005-0036-x

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  • DOI: https://doi.org/10.1007/s10789-005-0036-x

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