Abstract
Hydrogen molybdenum bronzes, H 0.21 MoO 3 (type I) and H0 .91 MoO 3 (type II) were characterized by Mo K-edge XAFS spectroscopy. XANES spectra showed that type I has an axially symmetric MoO 6 unit which is mainly connected to each other with vertices sharing and a MoO 6 unit in type II are similar to that in MoO 2 . EXAFS spectra suggested that the MoOx sheet in type I is similar to MoO 3 while in type II, a MoOx sheet is similar to that in rutile MoO 2 in which MoO 5 is connected 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 MoO 6 unit has C 4v symmetry. In case of type II, D 4h structure is possible and hydrogen is captured by Mo=O bonds resulting in the formation of Mo-OH bonds.
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