Solution and shock-induced exsolution of argon in vitreous carbon

Details Solution and shock-induced exsolution of argon in vitreous carbon Solution and shock-induced exsolution of argon in vitreous carbon

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104..337g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 104, no. 2-4, June 1991, p. 337-349.

Computer Science

1

Argon, Carbon, Grain Size, Rare Gases, Solubility, Vitreous Materials, Annealing, Carbonaceous Materials, High Pressure, Pressure Dependence, Shock Heating, Temperature Dependence

Scientific paper

To add to the knowledge of noble gas solution and exsolution in CARBONACEOUS material, experiments were performed on vitreous carbon. Ar-rich vitreous carbon samples were prepared under vapor-saturated conditions using argon as the pressurizing medium. Solubility data were obtained for temperatures of 773 to 973 K and pressures of 250 to 1500 bars. Up to 7 wt pct Ar was dissolved in the carbon. The solubility data were compared to a thermodynamic model of argon atoms dissolving into a fixed population of 'holes' in the carbon. Two variations of the model yielded estimates of the enthalpy of solution of Ar in vitreous carbon equal to about -4700 cal/mole. Preliminary shock experiments showed that 28 percent of the total argon was released by driving 4 GPa shocks into the argon-rich carbon. It was demonstrated that shock-induced argon loss is not simply caused by the impact-induced diminution of grain size. The present value of shock pressure required for partial impact devolatilization of Ar from carbon is below the range (5-30 GPa) at which H2O is released from phyllosilicates.

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