Characterization of Sb-doped Bi(2)UO(6) solid solutions by X-ray diffraction and X-ray absorption spectroscopy
N L Misra1, A K Yadav, Sangita Dhara
1Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400094, India. nlmisra@barc.gov.in
This study reports the first preparation of antimony-doped bismuth uranyl oxide solid solutions. Antimony doping beyond 4 at% leads to phase precipitation, with Sb(+3) replacing Bi(+3) in the crystal structure.
Area of Science:
- Solid-state chemistry
- Materials science
- Inorganic chemistry
Background:
- Bismuth uranyl oxide (Bi(2)UO(6)) is a material with potential applications.
- Understanding the effects of doping is crucial for tailoring material properties.
Purpose of the Study:
- To synthesize and characterize antimony-doped bismuth uranyl oxide solid solutions.
- To investigate the solubility limit and structural impact of antimony doping.
Main Methods:
- Solid-state reaction synthesis.
- X-ray diffraction (XRD) for phase analysis.
- X-ray absorption spectroscopy (XAS) including X-ray near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) at Bi and U L(3) edges.
Main Results:
- Successfully prepared Sb-doped Bi(2)UO(6) solid solutions within a limited composition range.
- XRD and XAS revealed phase precipitation when Sb doping exceeded 4 at%.
- Systematic variations in Bi absorption edges and local structure parameters confirmed doping effects up to 4 at% Sb.
Conclusions:
- The solubility limit for Sb doping in Bi(2)UO(6) is approximately 4 at%.
- Antimony in the +3 oxidation state substitutes for bismuth in the +3 oxidation state.
- The local structure around uranium remains unaffected by Sb doping.
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