A non-monotonic temperature dependence of the steady-state plasma-driven super-permeation of H through an Nb membrane was observed for the first time. Such a permeation behavior was related not only to the surface properties of the membrane, but also to its bulk properties and defects.

Plasma-Driven Superpermeation of Hydrogen through Nb Membranes - Bulk Effects. A.A.Skovoroda, V.S.Svishchov, A.V.Spitsyn, V.L.Stolyarov, Y.M.Pustovoit, V.D.Borman, V.S.Kulikauskas, A.M.Shipilin: Journal of Nuclear Materials, 2002, 306[2-3], 232-40