Abstract
The ternary germanide Ce 3Ni 2Ge 7 has been studied by means of neutron powder diffraction and Ce L III X-ray absorption (XAS). This compound which orders antiferromagnetically below T N=7.2(2) K, crystallizes in the orthorhombic (Cmmm space group) La 3Co 2Sn 7-type structure where Ce atoms occupying two inequivalent crystallographic sites: Ce1 at 2d site and Ce2 at 4i site. Below T N, the antiferromagnetic structure of Ce 3Ni 2Ge 7 is collinear but only the Ce2 atoms carry a magnetic moment (1.98(2) μ B at 1.4 K). The absence of ordered magnetic moment on Ce1 atoms can be correlated to the average valence v=3.03(1), determined by X-ray absorption spectroscopy, suggesting an intermediate valence state of cerium in the 2d site.
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