Argon solubility and diffusion in silica glass - Implications for the solution behavior of molecular gases

Details Argon solubility and diffusion in silica glass - Implications for the solution behavior of molecular gases Argon solubility and diffusion in silica glass - Implications for the solution behavior of molecular gases

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..211c&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Jan. 1991, p. 211-225.

Physics

13

Argon, Dissolved Gases, Gaseous Diffusion, Molecular Gases, Silica Glass, Activation Energy, Pressure Dependence, Silicon Dioxide, Temperature Dependence, Thermodynamic Properties

Scientific paper

Results are presented on the solubility and diffusivity of Ar in silica glass at temperatures of 400-900 C and at Ar pressures of 200-3725 bars, using the results of electron microprobe analyses of diffusion-controlled concentration gradients of Ar in quenched samples to determine the diffusivity and solubility of Ar. Samples were contained in unsealed capsules which were exposed to Ar gas used as the pressure-transmitting medium in cold-seal reaction vessels. It was found that the Ar solubility at 700 C increased linearly with increasing pressure up to about 1500 bars and that it can be described by Henry's law. At constant pressure, Ar solubility decreased with increasing temperature. The measured solubility variations could be described by a simple thermodynamic model in which the partial molar volume of Ar in SiO2 gas is 16.4 + or - 1.4 cu cm/mol and the enthalpy of solution at 1 bar is -4.76 + or - 0.26 kcal/mol.

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