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Title: Iron phosphate glasses: Bulk properties and atomic scale structure

Abstract

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 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 Cs2O 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 FeII content and average coordination number of iron in the glass network was estimated using Mössbauer spectroscopy. The FeII 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 withmore » 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.« less

Authors:
; ORCiD logo; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1409562
Report Number(s):
BNL-114614-2017-JA¿¿¿
Journal ID: ISSN 0022-3115
DOE Contract Number:  
SC0012704
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 494; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

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., and Smith, Roger. Iron phosphate glasses: Bulk properties and atomic scale structure. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.07.015.
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. Iron phosphate glasses: Bulk properties and atomic scale structure. United States. doi:10.1016/j.jnucmat.2017.07.015.
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., and Smith, Roger. Sun . "Iron phosphate glasses: Bulk properties and atomic scale structure". United States. doi:10.1016/j.jnucmat.2017.07.015.
@article{osti_1409562,
title = {Iron phosphate glasses: Bulk properties and atomic scale structure},
author = {Joseph, Kitheri and Stennett, Martin C. and Hyatt, Neil C. and Asuvathraman, R. and Dube, Charu L. and Gandy, Amy S. and Govindan Kutty, K. V. and Jolley, Kenny and Vasudeva Rao, P. R. and Smith, Roger},
abstractNote = {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 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 Cs2O 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 FeII content and average coordination number of iron in the glass network was estimated using Mössbauer spectroscopy. The FeII 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.},
doi = {10.1016/j.jnucmat.2017.07.015},
journal = {Journal of Nuclear Materials},
number = C,
volume = 494,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}