Lattice Parameter Behavior with Different Nd and O Concentrations in (U1-yNdy)O2±x Solid Solution
- Univ. of South Carolina, Columbia, SC (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The solid solution of (U1-yFPy)O-2±x, has the same fluorite structure as UO2±x lambda, and the lattice parameter is affected by dissolved fission product and oxygen concentrations. We investigated the relation between the lattice parameter and the concentrations of neodymium and oxygen in the fluorite structure of (U1-yNdy)O2±x using X-ray diffraction. Moreover, the lattice parameter behavior in the (U1-yNdy)O2±x, solid solution shows a linear change as a function of the oxygen-to-metal ratio and solubility of neodymium. The lattice parameter depends on the radii of ions forming the fluorite structure and also can be expressed by a particular rule (modified Vegard's law). Furthermore, the numerical analyses of the lattice parameters for the stoichiometric and nonstoichionietric solid solutions were conducted, and the lattice parameter model for the (U1-yNdy)O2±x, solid solution was assessed. There is a very linear relationship between the lattice parameter and the Nd and O concentration for the stoichiometry and nonstoichiometry of the (U1-yNdy)O2±x solid solution was verified.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1342664
- Journal Information:
- Nuclear Technology, Vol. 193, Issue 2; ISSN 0029-5450
- Publisher:
- American Nuclear Society (ANS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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