Peculiarities of the valence state of Ce and Yb in RM4Al8 (R = rare earth; M = Cr, Mn, Fe, Cu)

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 (...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 157-158; pp. 688 - 689
Main Authors Shcherba, I.D., Koterlyn, M.D., Kushnir, A.P., Kutjanskyj, R.R., Synjushko, V.G., Tsybukh, Yu.D., Yatsyk, B.M., Margolych, I.I.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 02.05.1996
Subjects
LIII, X-ray absorption
Magnetic susceptibility
Valence state
LIII, X-ray absorption
Valence state
Magnetic susceptibility
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Summary: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.
ISSN:0304-8853
DOI:10.1016/0304-8853(95)00988-4