Computer Science
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4853d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 23, pp.4853-4872
Computer Science
67
Scientific paper
Nano-diamonds isolated from acid dissolution residues of primitive carbonaceous meteorites (Allende and Murchison) were studied using high-resolution transmission electron microscopy. To discriminate among their most likely formation mechanisms, high-pressure shock-induced metamorphism or low-pressure vapor condensation, the microstructures of presolar diamond crystallites were compared to those of (terrestrial) synthesized nano-diamonds. The synthesized diamonds used for comparison in this study were produced by high-pressure shock waves generated in controlled detonations and by direct nucleation and homoepitaxial growth from the vapor phase in low-pressure chemical vapor deposition (CVD)-type processes. Microstructural features were identified that appear unique to shock metamorphism and to nucleation from the vapor phase, respectively. A comparison of these features to the microstructures found in presolar diamonds indicates that the predominant mechanism for presolar diamond formation is a vapor deposition process, suggesting a circumstellar condensation origin. A new presolar grain component has also been identified in the meteoritic residues, the (2H) hexagonal polytype of diamond (lonsdaleite).
Bernatowicz Thomas J.
Buseck Peter R.
Daulton Tyrone L.
Eisenhour Don Dee
Lewis Reed S.
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Science Enthusist
Diamonds made by red giant stars! Diamond stardust in space! How cool is that? This paper provides the most detailed study of diamonds formed around red giant stars. One of the images of diamond stardust in this paper is part of museum exhibit at the Smithsonian in DC. Now that is cool.
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