J. Phys. IV France 7 (1997) C2-763-C2-764
X-Ray Diffraction and X-Ray Absorption Spectrocopic Analyses for the Ruthenium PerovskitesJ.-H. Choy1, S.-H. Hwang1, G. Demazeau2 and D.-Y. Jung3
1 Department of Chemistry, Center for Molecular Catalysis, Seoul National University, Seoul 151-742, Korea
2 Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 33600 Pessac cedex, France
3 Beckman Institute, Urbana IL 61801, U.S.A.
According to the Rietveld refinements and X-ray absorption studies at the Ru K-edge, it is found that three compounds La2BRuO6 (B=Li, Mg, and Zn) are monoclinic with space group of P21/n, and that the ruthenium ions with two oxidation states +IV (d4) and +V(d3) are stabilized in an octahedral site of oxide lattices. A correlation is obtained between absorption edge position and the oxidation states of ruthenium. The bond lengths of (Ru-O) for both oxidation states (RuIV and RuV) have been quantitatively obtained by the EXAFS analysis.
© EDP Sciences 1997