An experimental time-dependent iso-volumetric gas-phase desorption technique was used to obtain the diffusive transport parameters. The study was performed at 673 to 1073K, using driving pressures which ranged from 1.3 x 104 to 105Pa. Characteristic H oscillation temperatures in the ground state and in the excited state were calculated by using the approximation of an ideal harmonic vibration of H-isotope atoms in a unique type of solution site. The extrapolated T

transport parameters which were obtained by using these oscillation temperatures were described by:

D (m2/s) = 5.34 x 10-10 exp[-11.2(kJ/mol)/RT]

G.A.Esteban, A.Perujo, L.A.Sedano, K.Douglas: Journal of Nuclear Materials, 2001, 295[1], 49-56