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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.

12 Issues per year


IMPACT FACTOR 2016: 3.179

CiteScore 2016: 3.30

SCImago Journal Rank (SJR) 2016: 1.097
Source Normalized Impact per Paper (SNIP) 2016: 2.592

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2196-7105
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In This Section
Volume 222, Issue 1 (Jan 2007)

Issues

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
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.2007.222.1.23

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

About the article

Received: 2006-04-27

Accepted: 2006-09-21

Published Online: 2009-09-25

Published in Print: 2007-01-01


Citation Information: Zeitschrift für Kristallographie, ISSN (Print) 0044-2968, DOI: https://doi.org/10.1524/zkri.2007.222.1.23.

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