The compound CeIrAl crystallizes in the orthorhombic -TiNiSi-type structure in which the cerium ions are in a mixed-valent state as inferred from its weakly temperature dependent magnetic susceptibility. This compound absorbs hydrogen at ambient temperature to form CeIrAlH 2 . A structural transformation from orthorhombic to hexagonal structure takes place on hydrogen absorption. Further, the magnetic susceptibility of the hydride exhibits Curie-Weiss behavior, typical of local moment on Ce 3ϩ ions. Thus hydrogen absorption brings about dramatic changes in the structure and the valence state of cerium in CeIrAl.
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