Computer Science
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987eprs.nasas....d&link_type=abstract
In NASA, Lyndon B. Johnson Space Center, Experiments in Planetary and Related Sciences and the Space Station 2 p (SEE N89-14998
Computer Science
Carbonaceous Chondrites, Electrical Resistivity, Temperature Effects, Grain Boundaries, Oxidation, Pyrolysis
Scientific paper
The electrical conductivity of samples of the Murchison and Allende carbonaceous chondrites is 4 to 6 orders of magnitude greater than rock forming minerals such as olivine for temperatures up to 700 C. The remarkably high electrical conductivity of these meteorites is attributed to carbon at the grain boundaries. Much of this carbon is produced by pyrolyzation of hydrocarbons at temperatures in excess of 150 C. As the temperature increases, light hydrocarbons are driven off and a carbon-rich residue or char migrates to the grain boundaries enhancing electrical conductivity. Assuming that carbon was present at the grain boundaries in the material which comprised the meteorite parent bodies, the electrical heating of such bodies was calculated as a function of body size and solar distance during a hypothetical T-Tauri phase of the sun. Input conductivity data for the meteorite parent body were the present carbonaceous chondrite values for temperatures up to 840 C and the electrical conductivity values for olivine above 840 C.
Burke John G.
Didwall E. M.
Duba A.
Sonett Charles P.
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