Abstract
The ternary silicide CeNiSi, which crystallises in the tetragonal LaPtSi-type structure (a=4.070(2)Å, c=14.030(5)Å), absorbs hydrogen at P(H2)=2MPa and T=393K to form the stable hydride CeNiSiH0.8(1). The hydrogenation induces (i) an anisotropic variation of the unit cell parameters (a=4.040(1)Å and c=14.253(4)Å) without significant increase of the unit cell volume (+0.1%) and (ii) a strong increase of the Kondo interaction in comparison with the initial ternary silicide. This last evolution is observed for the first time during insertion of H-atoms into CeNiX (X=np1 or np2 element) compounds. X-ray diffraction analysis, magnetic susceptibility and Ce LIII-edge X-ray absorption spectroscopy measurements performed on CeNiSi and CeNiSiH0.8(1) are reported and compared with those obtained on the isostructural RENiSiH1.0(1) hydrides with RE=La and Nd.
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