Metallic hydrides III: Body-centered-cubic solid-solution alloys

Hydrogen-absorbing alloys with bcc (body-centered-cubic) structures, such as' Ti-V-Mn,Ti-V-Cr, Ti-V-Cr-Mn, and Ti-Cr-(Mo, Ru), have been developed since 1993. These, alloys have a higher hydrogen capacity (about 3.0 mass%) than conventional intermetallic hydrogen-absorbing alloys. Generally, bcc metals and alloys exhibit two plateaus in pressure-composition isotherms, but the lower plateau is far below. atmospheric pressure at room temperature. Many efforts have been made to increase, hydrogen capacity, and, raise the equilibrium pressure of this lower plateau. The crystal structure and morphology of Laves-phase-related bcc solid-solution alloys are reviewed.