Add time:08/26/2019         Source:sciencedirect.com

The resonance Raman spectrum of ultramarine has been studied as a function of pressure up to 5 GPa. The overtone progressions of the ν1 fundamental and the combination bands of S3- and the ν1 band of S2- were measured and the pressure dependences were determined. The symmetric stretching mode of S3- is nearly harmonic. No phase transition was observed over the measured pressure range.

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