Hydrogen Permeation and Diffusion in Beryllium
Fusion Science and Technology / Volume 28 / Number 3P2 / October 1995 / Pages 1205-1210
Tritium Properties and Interaction with Material / Proceedings of the Fifth Topical Meeting on Tritium Technology In Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 / dx.doi.org/10.13182/FST95-A30573
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A precise hydrogen permeation experiment for beryllium was conducted at a temperature ranging from 735 to 1000 K under hydrogen gas pressure of 101 to 103 Pa. Diffusion coefficient and permeation coefficient were determined from the steady state penneation and time transient penneation independently. The steady state penneation rate was proportional to the square root of H2 pressure and the time sequence of penneation rate agreed well with theoretical one, indicating that the penneation controlled by bulk diffusion. The temperature dependencies of the penneation coefficients (Φ) and diffusion coefficients (D) were respectively,Φ=(1.0±0.1)×10−6exp[−73±20(kJ/mol)/RT] (mol·m−1·s−1·Pa1/2),D=(1.3±0.1)×10−7exp[59±20(kJ/mol)/RT] (m2·s−1).Solubility calculated from the relation Φ=DS wasS=7.1 exp[−14(kJ/mol)/RT] (mol·m−3·Pa−1/2).
