Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 45, Issue 4, Pages 305-313Publisher
WILEY
DOI: 10.1002/jrs.4457
Keywords
X-ray diffraction; impact diamond; Raman spectroscopy; lonsdaleite
Categories
Funding
- Russian Foundation for Basic Research (RFBR) [14-05-00616, 13-05-00568]
- Ministry of Education and Science of the Russian Federation
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Micro-Raman spectroscopy and X-ray diffraction method (XRD) were used to characterize impact carbonaceous rocks excavated from the Popigai crater (Siberia). The deconvolution of the first-order Raman spectra of the rocks containing different amounts of carbon phases (diamond, lonsdaleite and graphite) allowed the identification of lonsdaleite spectrum. The most intensive band at 1292-1303 cm(-1) was ascribed to A(1g) vibration mode of lonsdaleite, whereas the less intense band at 1219-1244 cm(-1) was attributed, in agreement with previously reported ab initio calculations, to E-2g vibration mode. The established correlation between the intensities of Raman and XRD peaks permits a rough estimation of lonsdaleite/diamond phase ratio in the impact rocks using micro-Raman measurements. The second-order Raman spectra of lonsdaleite-diamond rocks were recorded. Copyright (c) 2014 John Wiley & Sons, Ltd.
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