RIETVELD ANALYSIS AND CATALYTIC ACTIVITY ON CO OXIDATION OF A(2)BO(4)TYPE COMPLEX OXIDE 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1)

XRD Rietveld analysis has revealed that Dy0.5Sr1.5NiO4 complex oxide i s K2NiF4 type compound, tetragraphic unit cell and space group I4/mmm. A site and B site were found to exist disorder defects of about 3% to 7%. The average bond - valences of Mn and Ni in the B sites, which we re deduced from bond length by using bond - Valence relation, are abou t 3.8 and 2.9, respectively. The order of catalytic activity on CO oxi dation is as follows: x = 0.2 > 0.4 > 0.6 > 0.8 > 1.0 > 0.0, the effic iency of CO oxidation for x = 0.2 is 80% at 463 K and a gas space velo city of 5000 h(-1).