Physics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..937m&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 937.
Physics
Volatility, Graphite, Reduction (Chemistry), Evaporation, Gas Mixtures, Reaction Kinetics, Carbon Monoxide, Carbon Dioxide
Scientific paper
Previously, we presented experimental data on evaporation rates of SiC in various gas mixtures over wide temperature intervals and different f(O2)s. These data allowed us to calculate lifetimes of interstellar SiC grains under solar nebular conditions. Large isotopic anomalies are also present in some meteoritic graphite, indicating a presolar origin. Graphite, like SiC, is thermodynamically unstable under solar nebular conditions and should have undergone volatilization while immersed in the solar nebula and inside meteorite parent bodies. Survival of presolar graphite, in combination with an understanding of its kinetics of volatilization, may give us information on the physical conditions and duration of exposure of presolar grains in various environments. We present data on volatilization in reducing gas mixtures of highly ordered graphite grains, which are close in crystal structure to the outer rinds of the onion-like interstellar graphite particles.
Beckett John R.
Grossman Lawrence
Mendybaev Ruslan A.
Stolper Edward
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