Abstract
Hydrogen absorption and desorption properties of Hf-based intermetallic compounds were studied by high pressure differential scanning calorimetry (DSC) in an H 2 atmosphere and the Sieverts method. Structural changes were examined by powder X-ray diffractometry (XRD). The PCT curves of HfNi and HfCo showed the pressure plateau due to the formation of HfNiH 3 and HfCoH 3 with the CrB(B f ) type hydride, respectively. Hydrogen was absorbed forming a solid solution in Hf 2 Fe, Hf 2 Co, Hf 2 Ni, Hf 2 Cu, Hf 2 Pd, HfPd, HfV 2 , HfCr 2 , HfMn 2 and HfMo 2 . On the other hand, no hydrogen absorption was detected in HfFe 2 , HfCo 2 and HfPd 2 .
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