Different diamonds in meteorites - DaG 868 and NWA 3140 ureilites

• Autorzy: Karczemska A. , Jakubowski T. , Vergas F.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Ureilites are a rare type of meteorites containing tiny diamond grains. In our research we used two ureilites: NWA 3140 and DaG 868. The aim of this paper is to show the non-uniformity of carbon in ureilites, especially differences of ureilitic diamonds. Design/methodology/approach: One of the best methods to examine different allotropic forms of carbon is Raman Spectroscopy. This method used to investigate diamonds provides a lot of information about diamond polytypes, crystals sizes, a level of defects and internal stresses, etc. 2D imaging was done with a Confocal Raman Imaging alpha 300 R WITec apparatus equipped with an Nd:YAG laser with 532 nm excitation. The spectra were collected with a high-sensitive confocal microscope connected to a high-throughput spectrometer equipped with a CCD camera. Mean and local elemental compositions of the samples were determined by an energy dispersive X-ray (EDX) method. A scanning electron microscope HITACHI S-3000 N was used to characterize microstructures (carbon veins) of the samples. Findings: Different diamond generations were found in ureilites in the presented research with a wide range of Raman shifts from 1309 cm -1 to 1339 cm -1. Also graphite and amorphous carbon were found. Research limitations/implications: Presented research is another step to solve the problem about diamond origin in meteorites. Practical implications: Understending diamonds and the other carbon phases in meteortites could help in manufacturing new carbon materials in laboratory. Originality/value: Authors use Raman imaging to show distribution of diamonds in ureilites, this is pioneer research, results of DaG 868 and NWA 3140 are shown for the first time.

Słowa kluczowe

EN

diamond; meteorite; ureilite; Raman Imaging

PL

diament; meteoryt; urelit; obrazowanie ramanowskie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 292--297
• Opis fizyczny: Bibliogr. 20 poz., rys., tabl.

Twórcy

autor

Karczemska A.

autor

Jakubowski T.

autor

Vergas F.

• Institute of Turbomachinery, Technical University of Lodz, ul. Wólczańska 219/223, Łódź, Poland,

Bibliografia

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