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An X-ray absorption spectroscopy study of the local environment of iron in degradable iron-phosphate glasses

Qiu, Dong, Moss, Rob M., Pickup, David M., Ahmed, Ifty, Knowles, Jonathan C., Newport, Robert J. (2008) An X-ray absorption spectroscopy study of the local environment of iron in degradable iron-phosphate glasses. Journal of Non-Crystalline Solids, 354 (52-54). pp. 5542-5546. ISSN 0022-3093. (doi:10.1016/j.jnoncrysol.2008.08.008) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:15965)

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Abstract

Degradable iron-phosphate glasses with the composition of (CaO)(0.30)-(Na2O)(0.20-x)-(Fe2O3)(x)-(P2O5)(0.50), x = 0.01-0.05, were studied by Fe K-edge X-ray absorption spectroscopy (both near-edge, XANES, and extended, EXAFS). The addition of up to 5 mol% iron oxide is known to enhance the durability of the phosphate glass while maintaining biocompatibility. The results from the two techniques used here both show that iron is in the Fe(III) oxidation state and has octahedral coordination. This suggests that Fe is cross-linking the phosphate chains and therefore strengthening the network structure, resulting improved chemical durability of the glasses. (C) 2008 Elsevier B.V. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jnoncrysol.2008.08.008
Additional information: ISI Document Delivery No.: 383YP Times Cited: 0 Cited Reference Count: 34 Qiu, Dong Moss, Robert M. Pickup, Dave M. Ahmed, Ifty Knowles, Jonathan C. Newport, Robert J.
Uncontrolled keywords: Biomedical glass; Phosphates; X-ray absorption; Near-edge structure; Pre-edge; Fine structure; K-Edge; Xanes; FE; Oxidation; Minerals
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: J.M. Smith
Date Deposited: 12 May 2009 15:51 UTC
Last Modified: 16 Nov 2021 09:53 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/15965 (The current URI for this page, for reference purposes)
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