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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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, hollanditethe material in the multiphase titanate ceramics (Synroc) targeted for cesium sequestration.
Item Type: | Article |
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Additional Information: | PMID: 27989190 |
Identification Number: | https://doi.org/10.1021/acs.inorgchem.6b01826 |
Page Range: | 12686-12695 |
Depositing User: | Tzu-Yu Chen |
Date Deposited: | 21 Jun 2018 11:27 |
Last Modified: | 18 Mar 2021 00:31 |
URI: | https://shura.shu.ac.uk/id/eprint/21635 |
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