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Pressure Raman Studies on the Quenched High‐Pressure Phase of KTb(MoO 4 ) 2 with a KY(WO 4 ) 2 ‐Type Structure
Author(s) -
Sharma S. K.,
Jayaraman A.,
Wang S. Y.
Publication year - 1997
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/(sici)1097-4555(199701)28:1<39::aid-jrs62>3.0.co;2-x
Subject(s) - raman spectroscopy , orthorhombic crystal system , phase (matter) , chemistry , high pressure , bond length , raman scattering , phase transition , crystallography , analytical chemistry (journal) , crystal structure , thermodynamics , optics , organic chemistry , physics , chromatography
The high pressure–temperature quenched phase of KTb(MoO 4 ) 2 with the β‐KY(WO 4 ) 2 ‐type structure was synthesized and investigated by Raman scattering under pressure up to 26 GPa. The Raman spectral features were analyzed in terms of the structural units, in particular the MoO 6 polyhedra and the Mo—O bond lengths, by relating the structure of the phase with that of the β‐KY(WO 4 ) 2 . It is suggested that two types of MoO 6 groups may be present to account for the calculated Mo—O bond lengths. No pressure‐induced phase transition is found up to 26 GPa. The Tb fluorescence is totally absent in the quenched phase and reappears on heating to 500°C, when the conversion of the material to the original orthorhombic phase of KTMO takes place. © 1997 by John Wiley & Sons, Ltd.