| Numéro |
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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| Page(s) | C2-1143 - C2-1144 | |
| DOI | https://doi.org/10.1051/jp4:19972164 | |
J. Phys. IV France 7 (1997) C2-1143-C2-1144
DOI: 10.1051/jp4:19972164
Structural Analysis of Molybdenum Bronzes
T. Tanaka, H. Aritani, S. Yoshida, K. Eda, N. Sotani and S. HasegawaDepartment of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
Abstract
Hydrogen molybdenum bronzes, H0.21MoO3 (type I) and H0.91MoO3 (type II) were characterized by Mo K-edge
XAFS spectroscopy. XANES spectra showed that type I has an axially symmetric MoO6 unit which is mainly conncted to
each other with vertices sharing and a MoO6 unit in type II are similar to that in MoO2. EXAFS spectra suggested that the
MoOx sheet in type I is similar to MoO3 while in type II, a MoOx sheet is similar to that in rutile MoO2 in which MoO6 is
conneced to form a chain by sharing the edges of opposite sides. The curve fitting analysis of Mo-O bonds for type I
supported the earlier results obtained from diffraction and IR methods ; a MoO6 unit has C4v symmetry. In case of type II,
D4h structure is possible and hydrogen is captured by Mo=O bonds resulting in the formation of Mo-OH bonds.
© EDP Sciences 1997