Author:
Boldyreva Elena V.,Shakhtshneider Tatyana P.,Sowa Heidrun,Ahsbahs Hans
Abstract
Anin situX-ray powder diffraction study has shown the cubic modification of (NH4)2SiF6(cryptohalite, space groupFm¯3m) at 0.2–0.3 GPa to transform irreversibly into the trigonal bararite, space groupP¯3m1. The anisotropy of lattice strain in the high-pressure phase of (NH4)2SiF6was 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)2SiF6and Na2SiF6.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
5 articles.
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