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TiCrV hydrogen storage alloy studied by positron annihilation spectroscopy

Kawasuso, Atsuo; Arashima, Hironobu*; Maekawa, Masaki; Ito, Hideaki*; Kabutomori, Toshiki*

We have studied the degradation process of TiCrV hydrogen storage alloy alloy using positron annihilation spectroscopy. As the hydrogen storage capacity decreased with the number of pressure swing cycles, positron lifetime increased. The increase in positron lifetime is due to the volume expansion caused by hydride formation. After degassing at 500 $$^{circ}$$C, the hydrogen storage capacity recovered to the initial level. However, the positron lifetime was still longer than the initial level suggesting the survival of dislocations. The degradation of hydrogen storage capacity is probably caused by both hydride formation and the generation of dislocations.

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Category:Chemistry, Physical

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