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Effect of hydrostatic pressure up to 6 GPa on the crystal structures of ammonium and sodium hexafluorosilicates, (NH4)2SiF 6 and Na2SiF6; a phase transition in (NH 4)2SiF6 at 0.2-0.3 GPa

โœ Scribed by Boldyreva, Elena V. (author);Shakhtshneider, Tatyana P. (author);Sowa, Heidrun (author);Ahsbahs, Hans (author)

Book ID
115462137
Publisher
Oldenbourg Wissenschaftsverlag
Year
2007
Tongue
English
Weight
461 KB
Volume
222
Category
Article
ISSN
2194-4946

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Effect of hydrostatic pressure up to 6 G
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 0.2โ€“0.3 GPa
โœ Boldyreva, Elena V.; Shakhtshneider, Tatyana P.; Sowa, Heidrun; Ahsbahs, Hans ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› Oldenbourg Wissenschaftsverlag ๐ŸŒ English โš– 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__ยฏ3__m__) at 0.2โ€“0.3 GPa to transform irreversibly into the trigonal bararite, space group __P__ยฏ3__m__1. The anisotropy of lattice strain in the high-pressure phase of