High-pressure resonance Raman spectroscopic study of ultramarine blue pigment

Abstract

The resonance Raman spectrum of ultramarine has been studied as a function of pressure up to 5GPa. 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.