High-pressure Raman spectroscopy and lattice-dynamics calculations on scintillating MgWO4: A comparison with isomorphic compounds

Raman scattering measurements and lattice-dynamics calculations have been performed on magnesium tungstate under high pressure up to 41 GPa. Experiments have been carried out under a selection of different pressure-media. The influence of non-hydrostaticity on the structural properties of MgWO4 and...

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Bibliographic Details
Published in:arXiv.org 2011-07
Main Authors: Ruiz-Fuertes, J, Errandonea, D, Lopez-Moreno, S, Gonzalez, J, Gomis, O, Vilaplana, R, Manjon, F J, Munoz, A, Rodriguez-Hernandez, P, Friedrich, A, Tupitsyna, I A, Nagornaya, L L
Format: Article
Language:English
Subjects:
Magnesium
Mathematical analysis
Phase transitions
Raman spectra
Raman spectroscopy
Online Access:Get full text
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Summary:Raman scattering measurements and lattice-dynamics calculations have been performed on magnesium tungstate under high pressure up to 41 GPa. Experiments have been carried out under a selection of different pressure-media. The influence of non-hydrostaticity on the structural properties of MgWO4 and isomorphic compounds is examined. Under quasi-hydrostatic conditions a phase transition has been found at 26 GPa in MgWO4. The high-pressure phase has been tentatively assigned to a triclinic structure similar to that of CuWO4. We also report and discuss the Raman symmetries, frequencies, and pressure coefficients in the low- and high-pressure phases. In addition, the Raman frequencies for different wolframites are compared and the variation of the mode frequency with the reduced mass across the family is investigated. Finally, the accuracy of theoretical calculations is systematically discussed for MgWO4, MnWO4, FeWO4, CoWO4, NiWO4, ZnWO4, and CdWO4.
ISSN:2331-8422
DOI:10.48550/arxiv.1107.0160