1. Hydrogen Permeation Measurements on Alumina
- Author
-
E. Serra, G. Cosoli, Luciano Pilloni, and A. Calza Bini
- Subjects
Arrhenius equation ,Hydrogen ,Analytical chemistry ,chemistry.chemical_element ,Atmospheric temperature range ,Permeation ,Thermal diffusivity ,Hildebrand solubility parameter ,symbols.namesake ,chemistry ,Permeability (electromagnetism) ,Materials Chemistry ,Ceramics and Composites ,symbols ,Solubility ,Nuclear chemistry - Abstract
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 104–105 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−1·Pa−1/2 D=9.7·10−8 exp(−79990/RT) m2·s−1 Ks=5.5·10−3 exp(−22540/RT) mol·m−3·Pa−1/2
- Published
- 2004