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Dopant effect of simulated nuclear fuel, ceria solid solution on electron density distribution

Taguchi, Tomitsugu; Miwa, Shuhei  ; Igawa, Naoki   ; Birumachi, Atsushi; Yamaguchi, Kenji; Osaka, Masahiko  

The crystal structure and electron density distribution of simulated nuclear fuel, ceria solid solution were analyzed by the Rietveld method and the maximum entropy method using X-ray powder diffraction. The crystal structure was refined with the space group, ${it Fm-3m}$, the same as UO$$_{2}$$. We observed that the electron density distributed between metal- oxygen site and oxygen-oxygen sites with the isosuface level of 0.4 e/$AA $^{3}$$. Two-dimentional electron density distribution maps on (004) plain of the ceria solid solutions indicate that the shape and density of the electron diffusion path were affected by the dopants.

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