X-ray diffraction and X-ray absorption spectroscopic analyses for the ruthenium perovskites

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 P2(1)/n, and that the ruthenium ions with two oxidation states +IV (d(4)) and +V(d(3)) 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 (Ru-IV and Ru-V) have been quantitatively obtained by the EXAFS analysis.