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Nucleation experiments on a titanium-carbon system imply nonclassical formation of presolar grains

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Title: Nucleation experiments on a titanium-carbon system imply nonclassical formation of presolar grains
Authors: Kimura, Yuki Browse this author →KAKEN DB
Tanaka, Kyoko K. Browse this author
Inatomi, Yuko Browse this author
Aktas, Coskun Browse this author
Blum, Juergen Browse this author
Issue Date: 13-Jan-2023
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science advances
Volume: 9
Issue: 2
Start Page: eadd8295
Publisher DOI: 10.1126/sciadv.add8295
Abstract: Just as the shapes of snowflakes provide us with information on the temperature and humidity of the upper atmosphere, the characteristics of presolar grains in meteorites place limits on their formation environment in a stellar outflow. However, even in the case of well-characterized presolar grains consisting of a titanium carbide core and a graphitic carbon mantle, it is not possible to delimit their formation environment. Here, we have demonstrated the formation of core-mantle grains in gravitational and microgravity environments and have found that core-mantle grains are formed by a nonclassical nucleation pathway involving the three steps: (i) primary nucleation of carbon at a substantially high supersaturation, (ii) heterogeneous condensation of titanium carbide on the carbon, and (iii) fusion of nuclei. We argue that the characteristics of not only core-mantle grains but also other presolar and solar grains might be accurately explained by considering a nonclassical nucleation pathway.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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