Abstract
LIII X-ray absorption (77 and 300 K) and magnetic susceptibility measurements have been performed on RM4Al8 compounds. The mixed valence state of Ce was observed in CeM4Al8 with M = Cr, Mn, Fe. In the case of M = Cu the Ce3+ state is stabilized, but the Yb-based compound shows intermediate valence (VYb ≈ 2.5). In other Yb-based compounds, the Yb ion is mainly in the trivalent state. The temperature dependence of the magnetic susceptibility of RFe4Al8 compounds fits the Curie-Weiss law over a wide temperature range.
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