Order–disorder structural tailoring and its effects on the chemical stability of (Gd, Nd)2(Zr, Ce)2O7 pyrochlore ceramic for nuclear waste forms

Wang Yan; Wang Jin; Zhang Xue; Li Nan; Wang Junxia; Liang Xiaofeng

doi:10.1016/j.net.2022.02.001

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자료유형: 학술저널

저자정보: Wang Yan (Southwest University of Science and Technology) Wang Jin (Southwest University of Science and Technology) Zhang Xue (School of Materials Science and Engineering, Southwest University of Science and Technology) Li Nan (School of Materials Science and Engineering, Southwest University of Science and Technology) Wang Junxia (School of Materials Science and Engineering, Southwest University of Science and Technology) Liang Xiaofeng (Sichuan College of Traditional Chinese Medicine)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제7호

발행연도: 2022.7

수록면: 2,427 - 2,434 (8page)

DOI: 10.1016/j.net.2022.02.001

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Series of unequal quantity Nd/Ce co-doped ceramic nuclear waste forms, (Gd, Nd)2(Zr, Ce)2O7, were prepared to tailor its ordered pyrochlore or disordered fluorite structure. The phase transition, microtopography, and elemental composition of the ceramic samples were systematically investigated, especially the effect of order-disorder structure on the chemical stability. It was confirmed that unequal quantity of Nd/Ce could synchronously replace the Gd/Zr-sites of Gd2Zr2O7. And the phase transition of order-disorder structure could be successfully tailored by regulating the average cationic radius ratio of (Gd, Nd)2(Zr, Ce)2O7 series. The elements of Gd, Nd, Zr, and Ce are uniformly distributed in the ordered or disordered structures. The MCC-1 leaching results showed that (Gd, Nd)2(Zr, Ce)2O7 pyrochlore ceramic nuclear waste forms had excellent chemical stability, whose elements' normalized leaching rates were as low as 10 4 -10 7 g‧m 2 ‧d 1 after 7 days. In particular, the chemical stability of disordered structure was superior to that of ordered structure. It was proposed that the force constant and the closest packing were changed with the structure transformation resulting the chemical stability difference

#(Gd #Nd)2(Zr #Ce)2O7 pyrochlore ceramics #Nuclear waste immobilization Order-disorder structural tailoring #Co-doping #Chemical stability difference

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