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Fig. 2. Raman mapping images showing residual stresses in a diamond crystal (a–d), where the brightness shows the intensity of the selected peak at a point. The shift of the diamond peak (1332 cm–1) and the most intense coesite peak (521 cm–1) by 4 cm–1 and 12 cm–1, respectively (Fig. 2 b) indicates significant residual stresses in the diamond around the coesite inclusion and in the inclusion itself (Fig. 2 d, f). (g)–(h) – representative Raman spectra for a diamond crystal and a coesite inclusion in it (enlarged fragment from Fig. 1). |