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J. Korean Ceram. Soc. > Volume 40(9); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(9): 916.
doi: https://doi.org/10.4191/kcers.2003.40.9.916
Gd-doped UO2의 상분리 및 UO2에 고용된 Gd 함량 측정
김건식, 양재호1, 송근우1, 김길무2
한국원자력연구소 경수로연료개발부, 충남대학교 재료공학과
1한국원자력연구소 경수로연료개발부
2충남대학교 재료공학과
Phase Separation of Gd-doped UO2 and Measurement of Gd Content Dissolved in Uranium Oxide
ABSTRACT
The change of structure and morphology in ( $U_{0.913}$G $d_{0.087}$) $O_2$ during oxidation at 475$^{circ}C$ and heat treatment at 130$0^{circ}C$ in air were investigated using XRD, SEM, and EPMA. The ( $U_{0.913}$G $d_{0.087}$) $O_2$ cubic phase converted to ( $U_{0.913}$G $d_{0.087}$)$_3$ $O_{8}$ orthorhombic phase by oxidation at 475$^{circ}C$ in air. The XRD and EPMA result of the 130$0^{circ}C$ heat treated powder revealed that ( $U_{0.913}$G $d_{0.087}$)$_3$ $O_{8}$ orthorhombic phase was separated into $U_3$ $O_{8}$ and ( $U_{0.67}$G $d_{0.33}$) $O_{2+}$x/ cubic phase. The weight variations of (U,Gd) $O_2$ with various Gd contents were measured using TGA at the same heat treated condition. The weight variation during the heat treatment of Gd dissolve (U,Gd) $O_2$ in air can be expressed in terms of phase reaction equations related with oxidation and phase separation. Based on these phase reaction, a initial content of Gd dissolved in (U,Gd) $O_2$ can be exactly calculated by measuring the weight change during the heat treatment.t.
Key words: Phase separation, (U,Gd)$O_2$, Fuel pellet, Oxidation
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