1. Experimental refutation of the deuterium permeability in vanadium, niobium and tantalum
- Author
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Malo, M., Garcinuño, B., and Rapisarda, D.
- Subjects
Materials science ,Mechanical Engineering ,Tantalum ,Niobium ,chemistry.chemical_element ,Vanadium ,Thermodynamics ,Atmospheric temperature range ,Permeation ,Thermal diffusivity ,01 natural sciences ,010305 fluids & plasmas ,Nuclear Energy and Engineering ,chemistry ,Deuterium ,Permeability (electromagnetism) ,0103 physical sciences ,General Materials Science ,010306 general physics ,Civil and Structural Engineering - Abstract
Deuterium permeability through Nb, V, and Ta was measured in the temperature range between ∼300-500 °C and 100–1000 mbar. For the three materials, the permeation rate at 500 °C was between two and torders of magnitude below expected values which were obtained by combining diffusivity and solubility data and which have been traditionally accepted due to the insufficient experimental available data. Comparison with existing literature suggests a complex dependence of permeability with temperature, which helps explain this discrepancy. Given the important role of the surface condition on the permeability, additional deuterium permeation tests were carried out in vanadium for more realistic sample preparation. Results indicate that native oxides formed at room temperature introduce a permeation reduction of several orders of magnitude, and must be considered for practical applications.
- Published
- 2019
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