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Iron phosphate glasses: Bulk properties and atomic scale structure

DOI: 10.1016/j.jnucmat.2017.07.015 DOI Help

Authors: Kitheri Joseph (Indira Gandhi Centre for Atomic Research) , Martin C. Stennett (University of Sheffield) , Neil C. Hyatt (University of Sheffield) , R. Asuvathraman (Indira Gandhi Centre for Atomic Research) , Charu L. Dube (The University of Sheffield) , Amy S. Gandy (The University of Sheffield) , K. V. Govindan Kutty (Indira Gandhi Centre for Atomic Research) , Kenny Jolley (Loughborough University) , P. R. Vasudeva Rao (Indira Gandhi Centre for Atomic Research) , Roger Smith (Loughborough University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Nuclear Materials

State: Published (Approved)
Published: July 2017
Diamond Proposal Number(s): 6871 , 9489

Abstract: The 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 137Cs to 137Ba, relevant to the immobilisation of Cs in glass. These studies are required to establish the appropriate incorporation rate of 137Cs in iron phosphate glass. Density and glass transition temperature increases with the addition of BaO indicating the shrinkage and reticulation of iron phosphate glass network. Average thermal expansion coefficient reduces from 19.8 × 10−6 K−1 to 13.4 × 10−6 K−1, when 25 wt. % of Cs2O was replaced by 25 wt. % of BaO in caesium loaded iron phosphate glass. In addition to 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 FeII content and average coordination number of iron in the glass network was estimated using Mössbauer spectroscopy. FeII content in the un-doped iron phosphate glass and barium doped iron phosphate glasses were 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 Mössbauer data.

Subject Areas: Chemistry, Materials

Instruments: B18-Core EXAFS