Abstract
In this paper, we present results of high-pressure Raman scattering
studies in beta-MgMoO4 from atmospheric to 8.5 GPa. The experiments were
carried out using methanol-ethanol as pressure medium. By analyzing the
pressure dependence of the Raman data (change in the number of lattice
modes, splitting of bands and wavenumber discontinuities) we were able
to observe a phase transition undergone by the beta-MgMoO4 at 1.4 GPa,
which is only completed at similar to 5 GPa. The transition was observed
to be irreversible and the modifications in the Raman spectra were
attributed to the changes in coordination of Mo ions from tetrahedral to
octahedral. The transition possibly changes the original C2/m symmetry
to C2/m or to P2/c. Implication on the phase transition for similar
molybdate structures, such as alpha-MnMoO4, is also highlighted. (C)
2013 Elsevier B.V. All rights reserved.
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