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Zeitschrift für Kristallographie - Crystalline Materials

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Huppertz, Hubert / Petrícek, Václav / Pöttgen, Rainer / Schmahl, Wolfgang / Tiekink, E. R. T. / Zou, Xiaodong

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A Detailed Study of the Dehydration Process in Synthetic Strelkinite, Na[(UO2)(VO4)] · nH2O (n = 0, 1, 2)

Evgeny V. Suleimanov1 / Nikolay V. Somov2 / Evgeny V. Chuprunov3 / Ekaterina F. Mayatskikh4 / Wulf Depmeier5 / Evgeny V. Alekseev*

1Nizhny Novgorod State University, Nizhny Novgorod, Russische Föderation

2Nizhny Novgorod State University, Nizhny Novgorod, Russische Föderation

3Nizhny Novgorod State University, Nizhny Novgorod, Russische Föderation

4Nizhny Novgorod State University, Nizhny Novgorod, Russische Föderation

5Christian-Albrechts-Universität zu Kiel, Inst. für Geowissenschaften, Abt. Mineralogie/Kristallographie, Kiel, Deutschland

* Correspondence address: Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research, (IEK - 6), 52428 Jülich, Deutschland,

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials. Volume 227, Issue 8, Pages 522–529, ISSN (Print) 2194-4946, DOI: 10.1524/zkri.2012.1480, July 2012

Publication History

Published Online:
2012-07-16

This article offers supplementary material which is provided at the end of the article.

Abstract

Synthetic strelkinite Na[(UO2)(VO4)] · nH2O (n = 0, 1, 2) was systematically investigated by single crystal X-ray diffraction and thermoanalytical methods. The anhydrous form and two hydrates were isolated as single crystals and the structures of these phases solved: Na[(UO2)(VO4)], monoclinic, P21/c, a = 6.0205(1) Å, b = 8.3365(1) Å, c = 10.4164(2) Å, β = 100.466(2)°, V = 514.10(1) Å3, R1 = 0.0337; Na[(UO2)(VO4)] · H2O, monoclinic, P21/c, a = 7.722(2) Å, b = 8.512(1) Å, c = 10.480(4) Å, β = 113.18(3)°, V = 633.3(3) Å3, R1 = 0.1658; Na[(UO2)(VO4)] · 2 H2O, monoclinic, P21/n, a = 16.2399(5) Å, b = 8.2844(2) Å, c = 10.5011(2) Å, β = 97.644(2)°, V = 1400.24(6) Å3, R1 = 0.0776. A possible mechanism of the structural transformation processes during dehydration is proposed based on the structures of the anhydrous phase and the hydrates.

Keywords: strelkinite; uranyl vandate; Dehydration; Structural changes; Crystal structure

Supplementary Article Materials

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