Hydrogen permeation measurements on alumina

The aim of this work is to measure the hydrogen transport and solubility parameters in the commercial alumina. Measurements are conducted using a time-dependent permeation method over the temperature range 1273-1673 K with hydrogen driving pressures in the range 10(4)-10(5) Pa (100-1000 mbar). A half-power pressure dependence (diffusion-limited permeation) of the permeation flux for alumina is observed. The Arrhenius expressions for the hydrogen permeability, diffusivity, and Sieverts' constant values obtained from a fitting to the whole temperature range are as follows: P = 3.3. 10(-10) exp(- 97420/RT) mol(.)m(-1 .) s (.) Pa-1/2 D = 9.7(.)10(-8) exp(-79990/RT) m(2.)s(-1) K-s = 5.5 (.) 10(-3) exp(-22540/RT) mol (.) m(-3 .) Pa-1/2.