Raman spectroscopic studies of the various phases of crystalline ammonium fluosilicate (NH 4 ) 2  SiF 6 | Zendy

Poulet H. | Zendy; Mathieu J. P. | Zendy

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Raman spectroscopic studies of the various phases of crystalline ammonium fluosilicate (NH 4 ) 2 SiF 6

Author(s) -

Poulet H.,

Mathieu J. P.

Publication year - 1976

Publication title -

journal of raman spectroscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.748

H-Index - 110

eISSN - 1097-4555

pISSN - 0377-0486

DOI - 10.1002/jrs.1250050210

Subject(s) - raman spectroscopy , trigonal crystal system , crystallography , symmetry (geometry) , phase (matter) , atmospheric temperature range , ammonium , phase transition , chemistry , spectral line , materials science , analytical chemistry (journal) , crystal structure , condensed matter physics , optics , thermodynamics , physics , geometry , mathematics , organic chemistry , astronomy , chromatography

Raman spectra of oriented single crystals of (NH 4 ) 2 SiF 6 are reported for the temperature range 440–20 K. The trigonal phase stable below 278 K undergoes a transition at 38.6 K. The changes in the spectra show that the symmetry does not remain trigonal, but give evidence for a lower symmetry.

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