Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/897
Title: Fe-57 Mössbauer and Mo K-EXAFS Investigations of MoxFe3-xO4, an Interesting Mixed-Valent Oxide System
Authors: Bouet, L
Tailhades, P
Rousset, A
Kannan, K R
Verelst, M
Kulkarni, G U
Rao, C N R
Keywords: X-Ray
Exchange
Issue Date: Feb-1993
Publisher: Academic Press Inc
Citation: Journal of Solid State Chemistry 102(2), 414-422 (1993)
Abstract: Ferrites of the formula MoxFe3-xO4, prepared by a soft-chemistry route, show mixed valence states of both iron and molybdenum cations. Mössbauer studies show that Fe2+ and Fe3+ ions are present on both the A and B sites, giving Fe an average oxidation state between 2+ and 3+. Molybdenum is present in the 3+ and the 4+ states on the B sites. The presence of Mo in the 3+ state has been established by determining the Mo3+-O distance (2.2 Å), for the first time, by Mo K-EXAFS. The mixed valence of Fe on both the A and B sites and of Mo on the B sites is responsible for the fast electron transfer between the cations. All the Mössbauer parameters including the line width show a marked change at a composition (x ≈ 0.3) above which the concentration of Fe2+A increases rapidly.
Description: Restricted Access
URI: http://hdl.handle.net/10572/897
Other Identifiers: 0022-4596
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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