The ternary antimonide CeIrSb absorbs hydrogen under moderate temperature and pressure conditions (4 MPa and 573 K), leading to the hydride CeIrSbH 0.8 . The crystal structures of both compounds have been investigated by X-ray diffraction on powders and single crystals: TiNiSi type, space group Pnma , a =735.07(7), b =456.93(4), c =792.8(1) pm, R 1/w R 2=0.0206/0.0395, 601 F 2 values for CeIrSb and a =728.16(14), b =460.35(6), c =825.87(2) pm, R 1/w R 2=0.0322/0.0735, 528 F 2 values for CeIrSbH 0.8 with 20 variables per refinement. Hydrogenation induces both an increase of the cell volume V (+4%) and a strongly anisotropic expansion of the unit cell with a maximum of 4.3% in the c direction, leading to a significant increase of the Ce–Ir and Ce–Ce distances in this direction. The H-insertion into CeIrSb leads to a magnetic transition from intermediate valence to antiferromagnetic behavior ( T N =7.0 K) evidenced by magnetization, electrical resistivity and specific heat measurements. This transition can be explained on the basis of the Doniach diagram considering the J cf interaction between the 4 f (Ce) and conduction electrons.
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