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Title: Iron phosphate glasses: Bulk properties and atomic scale structure
Authors: Joseph, Kitheri
Stennett, Martin C.
Hyatt, Neil C.
Asuvathraman, R.
Dube, Charu L.
Gandy, Amy S.
Govindan Kutty, K.V.
Jolley, Kenny
Vasudeva Rao, P.R.
Smith, Roger
Issue Date: 2017
Publisher: © The Authors. Published by Elsevier
Citation: JOSEPH, K. ...et al., 2017. Iron phosphate glasses: Bulk properties and atomic scale structure. Journal of Nuclear Materials, 494, pp. 342-353.
Abstract: © 2017 The Authors Bulk properties such as glass transition temperature, density and thermal expansion of iron phosphate glass compositions, with replacement of Cs by Ba, are investigated as a surrogate for the transmutation of 137 Cs to 137 Ba, relevant to the immobilisation of Cs in glass. These studies are required to establish the appropriate incorporation rate of 137 Cs in iron phosphate glass. Density and glass transition temperature increases with the addition of BaO indicating the shrinkage and reticulation of the iron phosphate glass network. The average thermal expansion coefficient reduces from 19.8 × 10 −6 K −1 to 13.4 × 10 −6 K −1 , when 25 wt. % of Cs 2 O was replaced by 25 wt. % of BaO in caesium loaded iron phosphate glass. In addition to the above bulk properties, the role of Ba as a network modifier in the structure of iron phosphate glass is examined using various spectroscopic techniques. The Fe II content and average coordination number of iron in the glass network was estimated using Mössbauer spectroscopy. The Fe II content in the un-doped iron phosphate glass and barium doped iron phosphate glasses was 20, 21 and 22 ± 1% respectively and the average Fe coordination varied from 5.3 ± 0.2 to 5.7 ± 0.2 with increasing Ba content. The atomic scale structure was further probed by Fe K-edge X-ray absorption spectroscopy. The average coordination number provided by extended X-ray absorption fine structure spectroscopy and X-ray absorption near edge structure was in good agreement with that given by the Mössbauer data.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work was supported in part by EPSRC under grants EP/I012214/1 and EP/K007882.
Version: Published
DOI: 10.1016/j.jnucmat.2017.07.015
URI: https://dspace.lboro.ac.uk/2134/26410
Publisher Link: https://doi.org/10.1016/j.jnucmat.2017.07.015
ISSN: 0022-3115
Appears in Collections:Published Articles (Maths)

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