Abstract
Raman spectroscopy measurements of polycrystalline Na2MoO4 center dot
2H(2)O (NMHO) and Na2MoO4 (NM) under hydrostatic pressure (from 0 to 10
GPa) were performed. This study allowed us to monitor the stretching and
bending vibrations of MoO4 ions as well as the translational modes as a
function of pressure. The pressure dependence of the wavenumbers of the
modes indicates that the Na2MoO4 center dot 2H(2)O undergoes two phase
transitions at about similar to 3 and similar to 4 GPa. When releasing
pressure, we have observed that the original spectrum is recovered,
thereby pointing to a reversible process. The Na2MoO4 (NM) starting
phase was found to be stable up to 10 GPa. The pressure-dependent Raman
data for NM did not reveal any structural modification. The influence of
the pressure-transmitting medium on the phase transitions is also
discussed. Copyright (C) 2009 John Wiley & Sons, Ltd.
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