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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.


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Rank 8 out of 26 in category Cristallography in the 2015 Thomson Reuters Journal Citation Report/Science Edition

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2196-7105
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Effect of hydrostatic pressure up to 6 GPa on the crystal structures of ammonium and sodium hexafluorosilicates, (NH4)2SiF6 and Na2SiF6; a phase transition in (NH4)2SiF6 at 0.2–0.3 GPa

Elena V. Boldyreva / Tatyana P. Shakhtshneider / Heidrun Sowa / Hans Ahsbahs

Citation Information: Zeitschrift für Kristallographie. Volume 222, Issue 1, Pages 23–29, ISSN (Print) 0044-2968, DOI: 10.1524/zkri.2007.222.1.23, September 2009

Publication History

Received:
2006-04-27
Accepted:
2006-09-21
Published Online:
2009-09-25

An in situ X-ray powder diffraction study has shown the cubic modification of (NH4)2SiF6 (cryptohalite, space group Fm¯3m) at 0.2–0.3 GPa to transform irreversibly into the trigonal bararite, space group P¯3m1. The anisotropy of lattice strain in the high-pressure phase of (NH4)2SiF6 was measured up to 6 GPa and compared with that in the trigonal Na2SiF6. The pressure-induced changes in the packing of (SiF6)2– anions were analyzed, the changes in the IR-spectra of (SiF6)2– ions induced by increasing pressure and on decompression were measured and compared for trigonal (NH4)2SiF6 and Na2SiF6.

Keywords: Phase transitions; High pressure; Lattice strain; Bararite; Cryptohalite; Malladrite; X-ray diffraction; Powder diffraction structure analysis

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