Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-1179-C2-1180
DOI: 10.1051/jp4:19972182

XAFS Study on the Local Structure of Mo in Molten Nitrates

N. Matsubayashi^{1, 2}, C. Geantet¹, P. Afanasiev¹, Y. Soldo³ and J.L. Hazemann<sup>3, 4

1</sup>  Institut de Recherches sur la Catalyse, 2 avenue Albert Einstein, 69626 Villeurbanne cedex, France
²  National Institute of Materials and Chemical Research, 1-1, Higashi, Tsukuba, Ibaraki 305, Japan
³  Laboratoire de Cristallographie, 25 avenue des Martyrs, BP. 166, 38042 Grenoble cedex 09, France
⁴  LGIT CNRS, UJF, BP. 53X, 38041 Grenoble, France

Abstract
The local structure of Mo compounds in the intermediate states of the synthesis in molten nitrates media has been studied by the XAFS method. The XAFS results showed that the local structure around Mo changes from distorted octahedral form of MoO₃ to tetragonal form of MoO₄^2- via an intermediate phase during the reaction. It has been shown that the intermediate species of Mo oxide exist as a mixture of polymolybdate such as Mo₇O₂₄^6- and Mo₄O₁₃^2-.

© EDP Sciences 1997