Related Experiment Video
Updated: Jul 12, 2026

Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
Published on: May 9, 2025
Diffusion of Cesium Ions in H2O-Saturated Granitic Melt
Abstract:
The intrinsic self-diffusion coefficient (D) for cesium-134 in a granitic melt containing 6.1 to 6.3 percent (by weight) of dissolved H(2)O is three to four orders of magnitude higher than the values reported for chemically similar but dry granitic glass. For the temperature interval 700 degrees to 800 degrees C and a confining pressure of 2 kilobars, cesium diffusivity is given by D = 7.19 x 10(-5) exp (- 19.52 x 10(3)/RT), where R is the gas constant and T is the absolute temperature; the activation energy of about 20 kilocalories per mole is less than half the value for H(2)O-free glass. The observed increase in ionic mobility that accompanies solution of H(2)O implies sharply reduced equilibration times for chemical processes that occur in H(2)2O-bearing silicate melts.
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