Crystallographic and hydrogen sorption properties of TiMn2 based alloys

Microprobe analysis and X-ray powder diffraction were performed for a series of intermetallic compounds Ti0.95Zr0.05Mn1.45M0.5 where M=V, Cr, Mn, Co, Ni and Al. These compounds crystallize in the hexagonal C14-type Laves phase. The study of their hydriding properties at 298K shows that the intermetallics based on V and Cr present the best behavior (insertion of 3 H per formula unit and decrease of the plateau pressure to around 2.2 and 2.6 MPa, respectively). These properties can be rationalized by the crystal structure investigation.