Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..401g&link_type=abstract
Lunar and Planetary Science, volume 27, page 401
Computer Science
4
Calcium Carbonate: Evaporation, Carbon: Reduction, Condensates, Silicate: Evaporation, Vaporization
Scientific paper
Last year we reported the formation of a wide range of calcium silicates during vaporization of CaCO3-CaSO4/CaSO4 x 2H2O-SiO2 mixtures by a laser pulse, with application to the Chicxulub impact. It was shown that complex redox processes occur in the vapor cloud under dry conditions yielding part of the Si in metallic form and half the carbon as graphite. Here we investigated experimentally the Ca, Si and C high temperature chemistry using calcium carbonate-silicate targets. We used natural spurrite (Ca2SiO4 x CaCO3)and a compressed mixture of powders of CaCO3 and SiO2 with the same atomic Ca/Si ratio as in spurrite. The Ca-Si chemistry was found to be the same as in the previous research and independent of the initial state of Ca and Si in the target. Reduction of Si was found to be higher than in Gerasimov et al., amounting up to 9% of total Si. Different forms of reduced C were identified: C as graphite, silicon carbide, and complex carbon agglomerates of fullerene type.
Dikov Yu. P.
Gerasimov M. V.
Wlotzka Frank
Yakovlev O. I.
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