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

Qiu, D. and Moss, R.M. and Pickup, D.M. and Ahmed, I. and Knowles, J.C. and Newport, R.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.

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Official URL http://dx.doi.org/10.1016/j.jnoncrysol.2008.08.008

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
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 SPECTRA MODEL
Subjects:	Q Science
Divisions:	Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User:	J.M. Smith
Date Deposited:	12 May 2009 15:51
Last Modified:	06 Sep 2011 01:53
Resource URI:	http://kar.kent.ac.uk/id/eprint/15965 (The current URI for this page, for reference purposes)

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