Ce Valence State Probed by XAFS Study in Ce2Fe17-xGaxNy Compounds (M=Light Interstitial Element)

摘要

In the Ce2Fe17 alloy, cerium is known to be in an intermediate valence state. The sensitivity of cerium electronic state i its environment has been probed by XAFS experiment on the XAS3 station of the DCI Synchrotron radiation facility at LURE, 'e have studied the influence of interstitial element insertion on one hand and/or iron substitution by Ga on the other hand on the Ce L3 jsorption edge. The results of XAFS are discussed in the light of neutron diffraction experiments that yield the interstitial element location id the subsitution scheme in the local environment, this study shows that the large macroscopic magnetic change induces a significant solution of the Ce L3 absorption edge. A partial relocalization of the 4F states is observed.