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.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	556
Number	:
Pages	:	p.153189_1 - 153189_9
Publication Year/Month	:	2021/12
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2021.153189
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Keywords	:	XANES; EXAFS; ウラン酸化物; 固溶体; 結晶構造
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Registration No. : AA20210518
JAEA Abstracts No. : 51000432
Paper Submission No. : 26360

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Crystal structure of ULnO (Ln = Gd, Er) solid solution

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