Solubility and Diffusion of Hydrogen and Deuterium in Platinum

The diffusion and solubility of hydrogen and deuterium in monocrystalline platinum have been studied by a permeation method. The diffusion coefficient of hydrogen is D = (6.0 ± 3.5) × 10−3exp ( − 5.9 ± 1.0 kcal/RT) cm2sec−1, and the solubility in atom fraction H/Pt is given by S = 1.2 × 10−3exp (−11 kcal/RT). The isotope effects in permeation and diffusion (D1 / D2 = 1.16 ± 0.04 at 750°K) are analyzed in terms of an earlier theory. An Appendix discusses quantitatively errors due to absorption of gas by the walls of the apparatus in this type of experiment.