Crystal structure of U1-yLnyO2-x (Ln = Gd, Er) solid solution
Source abstract
Abstract
Abstract The crystal structure was evaluated for U1-yLnyO2-x (Ln = Gd, Er; y = 0−0.4) samples sintered at 1973 K for 8 h under Ar and Ar-10% H2 atmospheres. The effect of LnO1.5 doping on the crystal structure was investigated by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). The structures were refined by Rietveld analysis of the XRD patterns. LnO1.5 doping into UO2 reduced the lattice parameter of UO2−LnO1.5 solid solutions up to 40 mol % LnO1.5. The lattice parameters of these samples were comparable to those of stoichiometric (U,Ln)O2.00 solid solutions, that is, the O/M ratios were close to 2.00. XAFS spectra in the X-ray absorption near edge structure region showed that higher U oxidation states of +5 or +6 formed, in addition to +4. Extended XAFS indicated that the interatomic distances of U−O and Gd−O decreased with increasing y, whereas those of Er−O may not decrease monotonically.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Radioactive element chemistry and processing · Nuclear materials and radiation effects
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References (33)
Show source-provided references
1. A Comparison of Gadolinia and Boron for Burnable Poison Applications in Pressurized Water Reactors10.13182/NT83-A33122 ↗
2. Burnable absorber-integrated Guide Thimble (BigT) - I: design concepts and neutronic characterization on the fuel assembly benchmarks10.1080/00223131.2015.1090937 ↗
3. Concept of Erbium Doped Uranium Oxide Fuel Cycle in Light Water Reactors10.1080/18811248.2002.9715228 ↗
4. Simulate the effect of integral burnable absorber on the neutronic characteristics of a PWR assembly10.3897/nucet.4.30379 ↗
5. Analysis of Burnable Poison Effect on Combined (ThU)O2 Fuel Cycle Performance in 800 MWt Long-Life PWR
6. Ionic conductivity in the CeO2Gd2O3 system (0.05 Gd/Ce 0.4) prepared by oxalate coprecipitation10.1016/S0167-2738(02)00121-2 ↗
7. The effect of gadolinium content on the thermal conductivity of near-stoichiometric (U,Gd)O2 solid solutions10.1016/0022-3115(82)90375-0 ↗
8. Thermal conductivities of irradiated UO2 and (U,Gd)O210.1016/S0022-3115(00)00578-X ↗
9. Effect of Gd2O3 Dispersion on the Thermal Conductivity of UO210.1080/18811248.2007.9711574 ↗
10. Thermal and mechanical properties of (U,Er)O210.1016/j.jnucmat.2009.01.016 ↗
11. Thermodynamic reassessment of U-Gd-O system10.1016/j.jnucmat.2014.04.047 ↗
12. On the relation between lattice parameter and O/M ratio for uranium dioxide-trivalent rare earth oxide solid solution10.1016/0022-3115(81)90544-4 ↗
13. The Combined Influence of Gadolinium Doping and Non-stoichiometry on the Structural and Electrochemical Properties of Uranium Dioxide10.1016/j.electacta.2017.07.023 ↗
14. Thermal conductivity of near-stoichiometric (U,Er)O2 solid solutions10.1016/j.jnucmat.2005.03.020 ↗
15. Raman study on structure of U1-yGdyO2-x (y = 0.005, 0.01, 0.03, 0.05 and 0.1) solid solutions10.1016/j.jnucmat.2017.01.004 ↗
16. Sintering behavior of UO2-Er2O3 mixed fuel10.1016/j.jnucmat.2018.08.051 ↗
17. Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy10.1016/j.jnucmat.2017.03.042 ↗
18. WinXAS: a Program for X-ray Absorption Spectroscopy Data Analysis under MS-Windows10.1107/S0909049597019298 ↗
19. Chemical state analysis of simulated corium debris by EXAFS10.15669/pnst.5.200 ↗
20. Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure10.1103/PhysRevB.58.7565 ↗
21. Neutron Diffraction Study of the in Situ Oxidation of UO210.1021/ic9000889 ↗
22. Structural Change of C-Rare Earth Sesquioxides Yb2O3 and Er2O3 as a Function of Temperature10.2109/jcersj1950.93.1082_649 ↗
23. Space Group of U4O9 in the Beta Phase10.1016/0022-4596(89)90034-0 ↗
24. High temperature X-ray diffraction study of the U4O9 formation on UO2 sintered plates10.1016/0022-3115(91)90453-E ↗
25. Solid Solutions in the System Urania-Rare-Earth Oxides: I, UO2-GdO1.510.1111/j.1151-2916.1965.tb14735.x ↗
26. Heat Capacity Measurements of U1-yGdyO2 (y = 0-0.27) from 325 to 1,673 K10.1080/18811248.2004.9715466 ↗
27. Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chaleogenides10.1107/S0567739476001551 ↗
28. A first principle based study on the mechanical and thermal properties of UO2: Effect of La and Dy fission product concentrations10.1016/j.commatsci.2020.109933 ↗
29. Theoretical study on the mechanical and thermal properties of uranium dioxide doped with lanthanide fission products10.1016/j.jnucmat.2019.03.032 ↗
30. Local Structure and Charge Distribution in the UO2-U4O9 System10.1021/ic049748z ↗
31. Local Structure in U(IV) and U(V) Environments: The Case of U3O710.1021/acs.inorgchem.9b03702 ↗
32. New Technique for Investigating Noncrystalline Structures: Fourier Analysis of the Extended X-Ray-Absorption Fine Structure10.1103/PhysRevLett.27.1204 ↗
33. XAFS spectroscopy; fundamental principles and data analysis10.1023/A:1019105310221 ↗