We have obtained new Raman spectra for the polymorphs β-Mg2SiO4 (modified spinel) and γ-Mg2SiO4 (spinel). The spectrum for β-Mg2SiO4 is completely different from that reported earlier, whereas that for γ-Mg2SiO4 is better defined and shows the five peaks expected for the spinel structure. Despite the differences between these and our earlier Raman spectra, the heat capacities and entropies calculated for these phases using Kieffer’s model remain unchanged.
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