Electrochemical immobilization of Cs in single-crystalline SYNROC
Journal Article
·
· Journal of Solid State Chemistry
- National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305-0047 (Japan)
The development of a disposal technique for the radiotoxic {sup 137}Cs in nuclear wastes is one of the most urgent issues in nuclear fuel technology. An effective disposal method of {sup 137}Cs is to immobilize it in a synthetic rock (SYNROC) material: cesium titanate hollandite, {sup 137}Cs{sub x}Ti{sub 8}O{sub 16} (I4/m, a=10.2866(3)A, c=2.9669(1)A). Practical applications of {sup 137}Cs{sub x}Ti{sub 8}O{sub 16} have been restricted so far because the conventional synthetic method requires strong chemical reducers and reaction temperatures higher than 1250 deg. C. In this report, we present a milder preparation method of Cs{sub x}Ti{sub 8}O{sub 16} by electrolysis of a mixture of Cs{sub 2}MoO{sub 4} and TiO{sub 2} in ambient atmosphere at 900 deg. C. The Cs content in the resultant single-crystalline Cs{sub 1.35}Ti{sub 8}O{sub 16} is competitive with the highest value in polycrystalline Cs{sub 1.36+}/-{sub 0.03}Ti{sub 8}O{sub 16} prepared by the conventional synthetic method. The electrochemical preparation of Cs{sub 1.35}Ti{sub 8}O{sub 16} is a promising way to immobilize a high quantity of {sup 137}Cs ions in a stable form of single-crystalline SYNROC.
- OSTI ID:
- 20785017
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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