Mixed Valanced V3+,V2+ Phosphate Na7V4(PO4)6: A Structural Analogue of Mineral Yurmarinite

Two sodium vanadium phosphates, synthetic analogues of the minerals kosnarite, Na3V2(PO4)3, and yurmarinite, Na7V4(PO4)6, were obtained by hydrothermal synthesis simulating a natural hydrothermal solution. While the Na3V2(PO4)3 phase belongs to the NASICON family and is well-known for its high-ionic...

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Published inMinerals (Basel) Vol. 12; no. 12; p. 1517
Main Authors Kiriukhina, Galina, Nesterova, Valentina, Yakubovich, Olga, Volkov, Anatoly, Dimitrova, Olga, Trigub, Alexander, Lyssenko, Konstantin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 27.11.2022
Subjects
Analytical methods
Comparative analysis
Crystal structure
divalent vanadium
Habitus
Hydrothermal crystal growth
hydrothermal synthesis
Ion currents
Ion migration
Minerals
Oxidation
Phosphates
Radiation
Single crystals
Sodium
Spectroscopy
Symmetry
Synthesis
Vanadium
Vanadium compounds
X-ray diffraction
XANES spectroscopy
yurmarinite
Russia
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Summary:Two sodium vanadium phosphates, synthetic analogues of the minerals kosnarite, Na3V2(PO4)3, and yurmarinite, Na7V4(PO4)6, were obtained by hydrothermal synthesis simulating a natural hydrothermal solution. While the Na3V2(PO4)3 phase belongs to the NASICON family and is well-known for its high-ionic conductivity, the new Na7V4(PO4)6 compound is a rare case of V2+-containing oxosalts, which are hard to prepare due to their instability in air. Here we report the crystal structure of heterovalent vanadium phosphate studied by single crystal X-ray diffraction, XANES spectroscopy, and topological ion migration modelling. A discussion of divalent vanadium compounds of both natural and synthetic origin is also given, with a review of the methods for their synthesis and a comparative analysis of V–O bond lengths.
ISSN:2075-163X
2075-163X
DOI:10.3390/min12121517