A Potential Wasteform for Cs Immobilization: Synthesis, Structure Determination, and Aqueous Durability of Cs2TiNb6O18

Tzu Yu Chen; Ewan R. Maddrell; Neil C. Hyatt; Joseph A. Hriljac

doi:10.1021/acs.inorgchem.6b01826

A Potential Wasteform for Cs Immobilization: Synthesis, Structure Determination, and Aqueous Durability of Cs₂TiNb₆O₁₈

Tzu Yu Chen^*, Ewan R. Maddrell, Neil C. Hyatt, Joseph A. Hriljac

^*Corresponding author for this work

Chemistry

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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 P3Ìm1 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.

Original language	English
Pages (from-to)	12686-12695
Number of pages	10
Journal	Inorganic Chemistry
Volume	55
Issue number	24
Early online date	29 Nov 2016
DOIs	https://doi.org/10.1021/acs.inorgchem.6b01826
Publication status	Published - 2016

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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Chen_et_al_A_potential_wasteform_for_Cs_Inorganic_Chemistry_2016
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A Potential Wasteform for Cs Immobilisation: Synthesis, Structure Determination and Aqueous Durability of Cs2TiNb6O18
Hriljac, J. (Creator) & Chen, T.-Y. (Creator), University of Birmingham, 2016
DOI: 10.25500/eData.bham.00000040
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@article{ae74954335434aefa4aafb58c1f4b762,

title = "A Potential Wasteform for Cs Immobilization: Synthesis, Structure Determination, and Aqueous Durability of Cs2TiNb6O18",

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 P3{\`I}m1 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.",

author = "Chen, {Tzu Yu} and Maddrell, {Ewan R.} and Hyatt, {Neil C.} and Hriljac, {Joseph A.}",

year = "2016",

doi = "10.1021/acs.inorgchem.6b01826",

language = "English",

volume = "55",

pages = "12686--12695",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

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TY - JOUR

T1 - A Potential Wasteform for Cs Immobilization

T2 - Synthesis, Structure Determination, and Aqueous Durability of Cs2TiNb6O18

AU - Chen, Tzu Yu

AU - Maddrell, Ewan R.

AU - Hyatt, Neil C.

AU - Hriljac, Joseph A.

PY - 2016

Y1 - 2016

N2 - 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 P3Ìm1 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.

AB - 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 P3Ìm1 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.

U2 - 10.1021/acs.inorgchem.6b01826

DO - 10.1021/acs.inorgchem.6b01826

M3 - Article

AN - SCOPUS:85006835172

SN - 0020-1669

VL - 55

SP - 12686

EP - 12695

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 24

ER -

A Potential Wasteform for Cs Immobilization: Synthesis, Structure Determination, and Aqueous Durability of Cs2TiNb6O18

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A Potential Wasteform for Cs Immobilisation: Synthesis, Structure Determination and Aqueous Durability of Cs2TiNb6O18

Cite this

A Potential Wasteform for Cs Immobilization: Synthesis, Structure Determination, and Aqueous Durability of Cs₂TiNb₆O₁₈