Evaporation kinetics of forsterite and implications for the early solar nebula

Details Evaporation kinetics of forsterite and implications for the early solar nebula Evaporation kinetics of forsterite and implications for the early solar nebula

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347...53h&link_type=abstract

Nature (ISSN 0028-0836), vol. 347, Sept. 6, 1990, p. 53-55.

Physics

63

Chemical Fractionation, Evaporation, Forsterite, Reaction Kinetics, Solar System, Gas-Solid Interfaces, Thermodynamic Equilibrium

Scientific paper

Experiments on the kinetics of evaporation of Mg2SiO4 (forsterite), the most abundant mineral in planets and meteorites, are reported. Solid and liquid MgSiO4 evaporate very slowly, only about one-tenth as fast as they would if the vapor species produced by evaporation were those predicted by equilibrium thermodynamics and if no energy barrier in excess of the energy of reaction impeded the process. This large kinetic effect is due mainly to the transient production of gaseous SiO2 on evaporation. As a result, forsterite may evaporate at the same rate as an intrinsically more refractory material.

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