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Title: Synthesis and characterization of oxyapatite [Ca 2Nd 8(SiO 4) 6O 2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO 4] for a glass-ceramic waste form

Abstract

This paper discusses the synthesis, characterization, and chemical durability assessment of oxyapatite [Ca 2Nd 8(SiO 4) 6O 2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO 4]. These are the major crystalline phases that precipitate from the melt during cooling of a glass ceramic waste form currently being evaluated for immobilizing wastes produced during the aqueous reprocessing of used nuclear fuel. The oxyapatite was made at 99.7% purity using a solution-based process followed by heat treatments. The powellite, made by melting carbonates and slow-cooling the melt, formed two different phases, one rich in Ca (74.7%) and Sr (19.4%) (balance is Ba) and the other rich in Sr (25.6%) and Ba (65.6%) (balance is Ca). Following the product consistent test after 5 days, the oxyapatite phase had a maximum normalized loss of 0.024 g m -2 for Ca and the powellite phases showed a higher normalized loss from the Ba-powellite (0.22 g m -2) compared with the Sr-powellite (0.06 g m -2) and Ca-powellite (0.02 g m -2).

Authors:
; ; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1485422
Report Number(s):
PNNL-SA-133874
Journal ID: ISSN 0022-3115
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 510; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Peterson, Jacob A., Crum, Jarrod V., Riley, Brian J., Asmussen, R. Matthew, and Neeway, James J. Synthesis and characterization of oxyapatite [Ca2Nd8(SiO4)6O2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO4] for a glass-ceramic waste form. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.08.048.
Peterson, Jacob A., Crum, Jarrod V., Riley, Brian J., Asmussen, R. Matthew, & Neeway, James J. Synthesis and characterization of oxyapatite [Ca2Nd8(SiO4)6O2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO4] for a glass-ceramic waste form. United States. doi:10.1016/j.jnucmat.2018.08.048.
Peterson, Jacob A., Crum, Jarrod V., Riley, Brian J., Asmussen, R. Matthew, and Neeway, James J. Thu . "Synthesis and characterization of oxyapatite [Ca2Nd8(SiO4)6O2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO4] for a glass-ceramic waste form". United States. doi:10.1016/j.jnucmat.2018.08.048.
@article{osti_1485422,
title = {Synthesis and characterization of oxyapatite [Ca2Nd8(SiO4)6O2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO4] for a glass-ceramic waste form},
author = {Peterson, Jacob A. and Crum, Jarrod V. and Riley, Brian J. and Asmussen, R. Matthew and Neeway, James J.},
abstractNote = {This paper discusses the synthesis, characterization, and chemical durability assessment of oxyapatite [Ca2Nd8(SiO4)6O2] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO4]. These are the major crystalline phases that precipitate from the melt during cooling of a glass ceramic waste form currently being evaluated for immobilizing wastes produced during the aqueous reprocessing of used nuclear fuel. The oxyapatite was made at 99.7% purity using a solution-based process followed by heat treatments. The powellite, made by melting carbonates and slow-cooling the melt, formed two different phases, one rich in Ca (74.7%) and Sr (19.4%) (balance is Ba) and the other rich in Sr (25.6%) and Ba (65.6%) (balance is Ca). Following the product consistent test after 5 days, the oxyapatite phase had a maximum normalized loss of 0.024 g m-2 for Ca and the powellite phases showed a higher normalized loss from the Ba-powellite (0.22 g m-2) compared with the Sr-powellite (0.06 g m-2) and Ca-powellite (0.02 g m-2).},
doi = {10.1016/j.jnucmat.2018.08.048},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = C,
volume = 510,
place = {United States},
year = {2018},
month = {11}
}