Figure 5
(a) Comparison of a DFT-calculated Raman spectrum of Sr2CO4 (purple, this study), to DFT-calculated (green) and experimental (red) Raman spectra of Ca2CO4 at ∼20 GPa as obtained by Binck et al. (2021). (b) DFT-calculated Raman spectra of Sr2CO4 at different pressures. The shift of Raman modes towards higher frequencies implies positive Grüneisen parameters for all modes. All DFT-calculated Raman spectra have their x axis (Raman shift) multiplied by a scaling factor of 4%. |