J. Phys. IV France 7 (1997) C2-1191-C2-1192
XAFS Study of the Ce Valence in Magnetic Ce Intermetallic CompoundsO. Isnard1, S. Miraglia1 and F. Villain2
1 Laboratoire de Cristallographie, CNRS, BP. 166X, Université J. Fourier, 38042 Grenoble, France
2 Laboratoire LURE, Bât. 209D, Université Paris Sud, 91405 Orsay, France
We report on the XAFS analysis of the valence state of Ce in intermetallic compounds whose structure is of ThMn12 type. Ce is known to exhibit different valence state in intermetallic phases. Here we focus on iron-based Ce compounds, known for their prospective magnetic properties. We have studied the influence of iron substitution by non magnetic elements such as Ti, Ga, Al on the electronic state of cerium. The Ce L3 absorption edge XAFS is measured using the DCI synchrotron radiation facility at LURE. The spectra are discussed in terms of the change in the Ce valence as the result of progressive substitution of iron. The main magnetic properties are briefly presented.
© EDP Sciences 1997