“…In the present work, Nb 30 Ti 35 Co 35 (at.%) alloy, which is characterized by fully eutectic structure, BCC-(Nb, Ti) and B2-(Ti, Co) [24,25] and thus of good mechanical stability during operation, is chosen as the substrate alloy. The Pd/Nb 30 Ti 35 Co 35 /Pd composite membranes were reported to exhibit hydrogen permeability of 2.67 � 10 À 8 mol H 2 m À 1 s À 1 Pa À 0.5 for isotropic eutectic lamellae structure and 4.26 � 10 À 8 mol H 2 m À 1 s À 1 Pa À 0.5 for aligned eutectic lamellae structure at 400 � C [24,25]. In the present work, the stability of hydrogen permeability of the Pd/Nb 30 Ti 35 Co 35 /Pd composite membrane during hydrogen permeation test at temperatures above 400 � C has been analyzed.…”