Crystal and Electronic Structures of A 2 NaIO 6 Periodate Double Perovskites (A = Sr, Ca, Ba): Candidate Wasteforms for I-129 Immobilization
The synthesis, structure, and thermal stability of the periodate double perovskites A NaIO (A= Ba, Sr, Ca) were investigated in the context of potential application for the immobilization of radioiodine. A combination of X-ray diffraction and neutron diffraction, Raman spectroscopy, and DFT simulati...
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Published in | Inorganic chemistry Vol. 59; no. 24; pp. 18407 - 18419 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
21.12.2020
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Abstract | The synthesis, structure, and thermal stability of the periodate double perovskites A
NaIO
(A= Ba, Sr, Ca) were investigated in the context of potential application for the immobilization of radioiodine. A combination of X-ray diffraction and neutron diffraction, Raman spectroscopy, and DFT simulations were applied to determine accurate crystal structures of these compounds and understand their relative stability. The compounds were found to exhibit rock-salt ordering of Na and I on the perovskite B-site; Ba
NaIO
was found to adopt the
3
aristotype structure, whereas Sr
NaIO
and Ca
NaIO
adopt the
2
/
hettotype structure, characterized by cooperative octahedral tilting. DFT simulations determined the
3
and
2
/
structures of Ba
NaIO
to be energetically degenerate at room temperature, whereas diffraction and spectroscopy data evidence only the presence of the
3
phase at room temperature, which may imply an incipient phase transition for this compound. The periodate double perovskites were found to exhibit remarkable thermal stability, with Ba
NaIO
only decomposing above 1050 °C in air, which is apparently the highest recorded decomposition temperature so far recorded for any iodine bearing compound. As such, these compounds offer some potential for application in the immobilization of iodine-129, from nuclear fuel reprocessing, with an iodine incorporation rate of 25-40 wt%. The synthesis of these compounds, elaborated here, is also compatible with both current conventional and future advanced processes for iodine recovery from the dissolver off-gas. |
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AbstractList | The synthesis, structure, and thermal stability of the periodate double perovskites A
NaIO
(A= Ba, Sr, Ca) were investigated in the context of potential application for the immobilization of radioiodine. A combination of X-ray diffraction and neutron diffraction, Raman spectroscopy, and DFT simulations were applied to determine accurate crystal structures of these compounds and understand their relative stability. The compounds were found to exhibit rock-salt ordering of Na and I on the perovskite B-site; Ba
NaIO
was found to adopt the
3
aristotype structure, whereas Sr
NaIO
and Ca
NaIO
adopt the
2
/
hettotype structure, characterized by cooperative octahedral tilting. DFT simulations determined the
3
and
2
/
structures of Ba
NaIO
to be energetically degenerate at room temperature, whereas diffraction and spectroscopy data evidence only the presence of the
3
phase at room temperature, which may imply an incipient phase transition for this compound. The periodate double perovskites were found to exhibit remarkable thermal stability, with Ba
NaIO
only decomposing above 1050 °C in air, which is apparently the highest recorded decomposition temperature so far recorded for any iodine bearing compound. As such, these compounds offer some potential for application in the immobilization of iodine-129, from nuclear fuel reprocessing, with an iodine incorporation rate of 25-40 wt%. The synthesis of these compounds, elaborated here, is also compatible with both current conventional and future advanced processes for iodine recovery from the dissolver off-gas. |
Author | Sun, Shi-Kuan Knight, Kevin S O'Sullivan, Sarah E Montoya, Eduardo Weck, Philippe F Kim, Eunja Kirk, Cameron Hyatt, Neil C George, Jonathan Dixon Wilkins, Malin C |
Author_xml | – sequence: 1 givenname: Sarah E surname: O'Sullivan fullname: O'Sullivan, Sarah E organization: Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K – sequence: 2 givenname: Eduardo surname: Montoya fullname: Montoya, Eduardo organization: Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154, United States – sequence: 3 givenname: Shi-Kuan orcidid: 0000-0002-1688-5072 surname: Sun fullname: Sun, Shi-Kuan organization: Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K – sequence: 4 givenname: Jonathan surname: George fullname: George, Jonathan organization: Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154, United States – sequence: 5 givenname: Cameron surname: Kirk fullname: Kirk, Cameron organization: Department of Electrical and Computer Engineering, University of Nevada, Las Vegas, Nevada 89154, United States – sequence: 6 givenname: Malin C orcidid: 0000-0003-1520-7672 surname: Dixon Wilkins fullname: Dixon Wilkins, Malin C organization: Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K – sequence: 7 givenname: Philippe F orcidid: 0000-0002-7610-2893 surname: Weck fullname: Weck, Philippe F organization: Sandia National Laboratories, Albuquerque, New Mexico 87185, United States – sequence: 8 givenname: Eunja surname: Kim fullname: Kim, Eunja organization: Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154, United States – sequence: 9 givenname: Kevin S surname: Knight fullname: Knight, Kevin S organization: Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, U.K – sequence: 10 givenname: Neil C orcidid: 0000-0002-2491-3897 surname: Hyatt fullname: Hyatt, Neil C organization: Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K |
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Snippet | The synthesis, structure, and thermal stability of the periodate double perovskites A
NaIO
(A= Ba, Sr, Ca) were investigated in the context of potential... |
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Title | Crystal and Electronic Structures of A 2 NaIO 6 Periodate Double Perovskites (A = Sr, Ca, Ba): Candidate Wasteforms for I-129 Immobilization |
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