Nuclear Engineering and Technology

  • 제54권3호
  • /
  • Pages.997-1002
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Partitioning effects and corrosion characteristics of oxyapatite glass-ceramic wasteforms sequestering rare-earth elements

  • Kim, Miae (Division of Advanced Nuclear Engineering, Pohang University of Science and Technology) ;
  • Kang, Jaehyuk (Division of Advanced Nuclear Engineering, Pohang University of Science and Technology) ;
  • Yoon, Jang-Hee (Busan Centre, Korea Basic Science Institute) ;
  • Lee, Sang-Geul (Daegu Centre, Korea Basic Science Institute) ;
  • Um, Wooyong (Division of Advanced Nuclear Engineering, Pohang University of Science and Technology) ;
  • Kim, Hyun Gyu (Busan Centre, Korea Basic Science Institute)
  • 투고 : 2021.04.11
  • 심사 : 2021.08.30
  • 발행 : 2022.03.25
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초록

Oxyapatite[Ca2Nd8(SiO4)6O2] glass-ceramics have been suggested as wasteforms for the immobilisation of rare-earth radioactive nuclides because of their high waste-loading capability and good chemical durability. In particular, a partitioning effect is predicted to contribute to an enhancement of corrosion resistance in glass-ceramics compared with that of conjugate glasses of the same composition. Because rare-earths are inherently insoluble nuclides, detection of changes in corrosion behavior between glass-ceramics and conjugate glasses under normal conditions is not easy. In this study, therefore, we revealed the partitioning effect by exposing glass-ceramics and glasses to solution of pH 2, 7 and 10 at 90 ℃ for 20 d. In addition, we proposed the corrosion mechanism for oxyapatite glass-ceramics under various corrosion conditions. Especially, the glassy phase dissolved first, followed by the oxyapatite phase during pH 7 corrosion.

키워드

과제정보

This research was supported by 'NST*-KBSI† Postdoctoral Research Fellowship for Young Scientists' at KBSI† in South KOREA. (*National Research Council of Science & Technology/†Korea Basic Science Institute) A portion of research was supported by the National Research Foundation of Korea (NRF), (NRF-2017M2B2B1072374 and NRF-2017M2B2B1072404). This work was supported by Busan Metropolitan City, Korea, Grant No. PO2019057and Korea Basic Science Institute Grant C140320.

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