The effect of C/O ratio on the condensation of planetary material

Details The effect of C/O ratio on the condensation of planetary material The effect of C/O ratio on the condensation of planetary material

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..389l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Mar. 1975, p. 389-392.

Other

23

Abundance, Carbon, Condensation, Cosmic Gases, Oxygen, Planetary Evolution, Chemical Reactions, Nebulae, Refractory Materials, Silicates, Temperature Effects

Scientific paper

The condensation temperatures of refractory silicates and oxides in a gas of cosmic composition are strongly dependent on the C/O ratio. As the ratio increases from 0.4 to 0.9, condensation temperatures of compounds such as Al2O3, Ca2Al2SiO7, MgAl2O4, Mg2SiO4, and MgSiO3 decrease by 50-100 degrees. As C/O increases from 0.9 to 1.0, these temperatures drop an additional 300-400 degrees. Other chemical differences result when C/O approximately equals or exceeds 0.9. A new suite of high-temperature minerals appears (graphite, CaS, Fe3C, SiC and TiN); the reaction CO + 3H2 yields CH4 + H2O proceeds to the right at higher temperatures; and iron, whose condensation temperature is unaffected, condenses at higher temperatures than any silicate or oxide.

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