A potential wasteform for Cs immobilization: synthesis, structure determination, and aqueous durability of Cs2TiNb6O18

CHEN, Tzu-Yu, MADDRELL, Ewan R., HYATT, Neil C. and HRILJAC, Joseph A. (2016). A potential wasteform for Cs immobilization: synthesis, structure determination, and aqueous durability of Cs2TiNb6O18. Inorganic Chemistry, 55 (24), 12686-12695.

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Official URL: https://pubs.acs.org/doi/10.1021/acs.inorgchem.6b0...
Link to published version:: https://doi.org/10.1021/acs.inorgchem.6b01826

Abstract

Cs2TiNb6O18 is a potential ceramic wasteform for the long-term immobilization of radioactive cesium. Cs2TiNb6O18 was synthesized using the aqueous precursor method and a solid-state reaction, and its crystal structure was determined from the Rietveld refinement of synchrotron X-ray and neutron powder diffraction data. The structure is a pyrochlore analogue, space group P3̅m1 with Cs in 9-fold coordination. The calculated bond valence sum from analysis of neutron diffraction data of 0.84 and high coordination number suggest that Cs has a strong bonding environment. The chemical aqueous durability was investigated using the MCC-1 and PCT-B standard test methods. The measured Cs leach rates of 3.8 × 10−3 and 2.1 × 10−3 g m−2 day−1 obtained via the MCC-1 and PCT-B methods, respectively, demonstrate good promise of a safe long-term immobilization material comparable to, if not better than, hollanditethe material in the multiphase titanate ceramics (Synroc) targeted for cesium sequestration.

Item Type: Article
Additional Information: PMID: 27989190
Identification Number: https://doi.org/10.1021/acs.inorgchem.6b01826
Depositing User: Tzu-Yu Chen
Date Deposited: 21 Jun 2018 11:27
Last Modified: 23 Jun 2018 09:37
URI: http://shura.shu.ac.uk/id/eprint/21635

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