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. (C) 2000 Elsevier Science Ltd. All rights reserved.