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A new modification of di­ammonium hexa­fluoro­silicate, (NH4)2SiF6

✍ Scribed by Fábry, Jan ;Chval, Jindřich ;Petříček, Václav

Book ID
104478823
Publisher
International Union of Crystallography
Year
2001
Tongue
English
Weight
186 KB
Volume
57
Category
Article
ISSN
1600-5368

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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
✍ Boldyreva, Elena V.; Shakhtshneider, Tatyana P.; Sowa, Heidrun; Ahsbahs, Hans 📂 Article 📅 2007 🏛 Oldenbourg Wissenschaftsverlag 🌐 English ⚖ 461 KB

An __in situ__ X-ray powder diffraction study has shown the cubic modification of (NH~4~)~2~SiF~6~ (cryptohalite, space group __Fm__¯3__m__) at 0.2–0.3 GPa to transform irreversibly into the trigonal bararite, space group __P__¯3__m__1. The anisotropy of lattice strain in the high-pressure phase of