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Pressure‐Induced Phase Transitions in KDy(MoO 4 ) 2 and KY(MoO 4 ) 2 : a High‐Pressure Raman Study
Author(s) -
Jayaraman A.,
Sharma S. K.,
Wang S. Y.,
Shieh S. R.,
Ming L. C.,
Cheong S.W.
Publication year - 1996
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(199606)27:6<485::aid-jrs985>3.0.co;2-e
Subject(s) - orthorhombic crystal system , raman spectroscopy , phase transition , phase (matter) , chemistry , diffraction , analytical chemistry (journal) , potassium , crystallography , materials science , crystal structure , condensed matter physics , optics , physics , organic chemistry , chromatography
High‐pressure Raman studies on potassium–rare earth double molybdates, KDy(MoO 4 ) 2 and KY(MoO 4 ) 2 , up to 35 GPa are reported. The Raman data indicate the occurrence of a reversible pressure‐induced phase transition near 3 GPa, from the orthorhombic Pbcn phase. High‐pressure x‐ray diffraction measurements suggest that the new phase is also orthorhombic and has a smaller volume. The phase transition is structurally similar to that observed in KTb(MoO 4 ) 2 near 3 GPa and seems to be characteristic of the layer‐type orthorhombic, potassium–heavy rare earth dimolybdates. Changes in optical transmission observed in all three dimolybdates are compared and discussed.