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The time dependent gas-phase isovolumetric desorption technique has been used with protium and deuterium over a temperature range of 673 to 1073 K and driving pressures ranging from 1.3E4 to 1E5 Pa, to obtain the hydrogen diffusive transport parameters: diffusivity (D), Sieverts' constant (K{s}) and permeability (Phi), and the trapping parameters: the trap site concentration (N{t}) and the trapping energy (E{t}), in pure tungsten.

On the basis of ideal harmonic vibration of the hydrogen isotope atoms in a unique type of solution site, the values derived for the characteristic protium oscillation temperatures are: theta =893 K and theta =2467 K. These values lead to the extrapolated tritium transport parameters.

Additional information

Authors: ESTEBAN G, JRC-Environment Institute, Renewable Energies Unit, Ispra (IT);PERUJO A, JRC-Environment Institute, Renewable Energies Unit, Ispra (IT);DOUGLAS K, JRC-Environment Institute, Renewable Energies Unit, Ispra (IT)
Bibliographic Reference: EUR 19654 EN (2000) 43pp., Euro: FREE of charge
Availability: Available from European Commission, DG XII Communication Unit rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Tel: +32-2-2950001 Fax:+32-2-2958220 email:
ISBN: ISBN:Not available
Record Number: 200012906 / Last updated on: 2000-12-01
Original language: en
Available languages: en