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Formation abilities of perovskite-type hydrides in Ca 1+x T–H, where T=3d transition metals and x=0–1.0, were examined. CaNiH 3 and CaCoH 3 were found to form the cubic perovskite structure. In the former hydride, the maximum amount of Ni vacancy is estimated to be approximately 20%, CaNi 0.8 H 3 , using powder neutron diffraction measurements. The thermal desorption...
Reversible hydriding and dehydriding reactions were experimentally confirmed in the perovskite-type hydride, NaMgH 3 . Nearly 6.0mass% of hydrogen was released from NaMgH 3 within 8min at 673K, and two plateau pressures of about 0.15 and 0.040MPa were clearly observed in the p–c isotherm measurement at the same temperature.
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