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Crystal structure of U$$_{1-y}$$Ln$$_{y}$$O$$_{2-x}$$ (Ln = Gd, Er) solid solution

Pham, V. M.*; Arima, Tatsumi*; Inagaki, Yaohiro*; Idemitsu, Kazuya*; Akiyama, Daisuke*; Nagai, Takayuki  ; Okamoto, Yoshihiro  

The crystal structure change was evaluated for (1-x)UO$$_{2}$$-xLnO$$_{1.5}$$ (Ln=Gd or Er; x = 0 to 0.4) samples sintered at 1973 K for 8 h under Ar and Ar-10%H$$_{2}$$ atmospheres. The effect of LnO$$_{1.5}$$ doping on the crystal structure of UO$$_{2}$$ was investigated by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). LnO$$_{1.5}$$ doping into UO$$_{2}$$ reduced the lattice parameter of UO$$_{2}$$-LnO$$_{1.5}$$ solid solutions up to 40mol% LnO$$_{1.5}$$. The lattice parameters of these samples were comparable to those of stoichiometric (U,Ln)O$$_{2.00}$$ solid solutions, that is, the O/M ratios were close to 2.00. The U L$$_{3}$$-edge XANES analysis showed that higher U oxidation states of +5 or +6 formed, in addition to + 4. The EXAFS analysis indicated that the interatomic distances of U-O and Gd-O decreased with increasing x, whereas those of Er-O may not decrease monotonically.

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Category:Materials Science, Multidisciplinary

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