Add time:08/01/2019         Source:sciencedirect.com

The interaction of hydrogen with the La15Ni8Si9H31, Ce15Ni9Si8H35 (Pr15Ni7Si10 type structure) and CeNi0.6Si1.4 (AlB2-type structure) has been studied. These compounds belong to the homologous Rn2+3n+2T2n2+2 (R=La, Ce; T=Ni, Si, n=2, 3, 4, ∞) series with the Ce6Ni2Si3, Ce2NiSi, Pr15Ni7Si10 and AlB2 structure types. The new hydride phases La15Ni8Si9H31 and Ce15Ni9Si8H35 have been synthesised and characterised by X-ray diffraction and thermodesorption. CeNi0.6Si1.4 (n→∞, AlB2-type structure) did not react with hydrogen at a pressure up to 200 MPa at room temperature. The hydrides preserved the structure type of the starting compounds with anisotropic unit cell distortion: the lattice parameter a and the unit cell volume v increased (da/a≈0.07, dV/V≈0.09), while the parameter c decreased (dc/c≈−0.04). The homologous Rn2+3n+2T2n2+2 (R=La, Ce; T=Ni, Si) compounds form hydrides with general formula Rn2+3n+2T2n2+2H∼(2n2+3n+4) (n=2, 3, 4) with anisotropic unit cell distortion: the lattice parameter a and the unit cell volume v increased, while the parameter c decreased. Some suggestions on hydrogen localisation in the crystal lattice and their anisotropic distortion have been proposed.

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