Abstract
In this work, Ti25Zr25Nb25Hf25 and Ti20Zr20Nb20Hf20Ta20 powders were obtained by the calciothermic reduction of oxide mixtures at 1200°C, and the structure and hydrogen properties were investigated. Tantalum has a negative effect, preventing the formation of a homogeneous structure, while the Ta-free alloy tends to form a single BCC phase. The TiZrHfNb powder, with its homogeneous structure, exhibits faster absorption kinetics up to 0.5 wt% H2 and a higher hydrogen capacity of 1.93 wt% (H/M = 1.98). Our results indicate that homogeneous structure is crucial for enhanced sorption properties.
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