Hydrogen absorption and desorption properties of Hf-based intermetallic compounds

Abstract

Hydrogen absorption and desorption properties of Hf-based intermetallic compounds were studied by high pressure differential scanning calorimetry (DSC) in an H2 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 HfNiH3 and HfCoH3 with the CrB(Bf) type hydride, respectively. Hydrogen was absorbed forming a solid solution in Hf2Fe, Hf2Co, Hf2Ni, Hf2Cu, Hf2Pd, HfPd, HfV2, HfCr2, HfMn2 and HfMo2. On the other hand, no hydrogen absorption was detected in HfFe2, HfCo2 and HfPd2.