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Effect of hydrostatic pressure on the vibrational properties and the structure of SrWO 4 and PbMoO 4
Author(s) -
Ganguly B. N.,
Nicol M.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220790227
Subject(s) - phonon , raman spectroscopy , degenerate energy levels , hydrostatic pressure , spectral line , lattice (music) , condensed matter physics , chemistry , high pressure , materials science , physics , thermodynamics , optics , quantum mechanics , astronomy , acoustics
Raman spectra of SrW0 4 are measured up to 35 kbar at 300 K. At (21 ± 2) kbar the doubly‐degenerate Eg modes are observed to split which indicates a structural transformation to a lower symmetry. The high pressure Raman spectra are similar to spectra of the 2h 4structure of ZnW0 4 . Raman spectra of PbMoO 4 are also measured up to 35 kbar at both 300 and 80 K, but no evidence of a structural change is observed. The pressure dependence of the phonon spectra suggests the presence of harmonic phonon‐phonon interaction in this system. The possible origins of the different high pressure form of the scheelites are discussed on the basis of lattice phonon‐phonon interaction.