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Vibrational spectroscopy at very high pressures. 47—Raman scattering study of K 3 Cu(CN) 4 : A trigonally distorted species
Author(s) -
Adams David M.,
Hatton Peter D.
Publication year - 1987
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.1250180810
Subject(s) - raman spectroscopy , chemistry , trigonal crystal system , ambient pressure , raman scattering , phase transition , analytical chemistry (journal) , phase (matter) , infrared spectroscopy , crystallography , diamond anvil cell , spectral line , high pressure , crystal structure , condensed matter physics , optics , thermodynamics , physics , organic chemistry , chromatography , astronomy
K 3 Cu(CN) 4 displays a high‐pressure phase transition at 14 kbar and another at ca 100 kbar (as estimated visually using an ungasketted diamond anvil cell). No Raman spectra could be obtained for phase III but the Raman spectra of phase II show that the trigonal distortion evident at ambient pressures is retained. The suggested space group of phase II is C 3 4 , a maximal zellengleich descent of the ambient structure, C 3v 6 . As with K 2 M(CN) 4 (M = Zn, Cd or Hg), a trigonal distortion appears favoured under external pressure.