Characterisation of Diamond in the Almahata Sita Meteorite

Details Characterisation of Diamond in the Almahata Sita Meteorite Characterisation of Diamond in the Almahata Sita Meteorite

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0908s&link_type=abstract

American Astronomical Society, DPS meeting #41, #9.08

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Confocal Raman Imaging Spectroscopy (CRIS) was conducted on small particles of the Almahata sita meteorite. The major carbon phase is highly crystalline graphite, some of which are flaky crystals. Raman spectra show the grains to be amongst the most graphitic of any meteorite currently studied with a G band centre and G band full width half max of 1572 +/- 2.1 cm-1 and 42 +/-5 cm-1 potentially indicating a parent body temperature of 950 ± 120 oC. Initial results indicate that increased order is seen proximal to grains of magnetite but as this is a very slight G band width phenomena, further investigations are continuing. Diamond aggregates ranging up to several micrometers in dimension are contained within graphite grains. The Raman G band peak centre of the diamonds appears to show that the diamonds are under mild tensile strain of around 0.18 GPa. We compare the diamonds in Almahata sita meteorite with 2 other Ureilites and both CVD-grown and shock-formed diamond materials.

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