New hydride formation of MoSi 2-type intermetallic compounds at hydrogen pressures up to 2000 atm

Abstract

The interaction of the MoSi 2-type intermetallic compounds Zr 2Pd, Hf 2Pd and Hf 2Cu with hydrogen at pressures up to 2000 atm has been investigated. Absorption and desorption isotherms were measured at 293 K. For each system the formation of two hydride phases was established: tetragonal A 2BH ∼3 and orthorhombic A 2BH 5.5–6. The volume expansions for these phases were 8%–10% and 21%–25% respectively. The thermal desorption of hydrogen from these phases was also studied.