ANION-EXCESS FLUORITE TYPE SOLID-SOLUTIONS MF2-NDF3 AND MF2-UF4 (M = CA, BA) - CONDUCTIVITY AND EXAFS SPECTROSCOPIC STUDY
- Grandjean, Didier
- CHALLIER, T
- JONES, DJ
- VITSE, P
DOIAbstract
The evolution of the electrical properties of fluorite-type solid solutions Ba1-xUxF2+2x (0<x<0.24), Ba1-xNdxF2+x (0<x<0.30) and Ca1-xNdxF2+x (0<x<0.30), with temperature up to 800°C has been investigated, and the conductivity of the solid solutions has been studied as a function of their composition and the nature of the aliovalent metal ion. At 800°C, the conductivity of all the solid solutions reaches a maximum value of ca. 10 Sm-1. An EXAFS spectroscopic study of the Ba1-xUxF 2+2x system has allowed the definition of the local environment of uranium in solid solutions containing up to 25 mo1% of the element. In this structure, uranium is surrounded by 9 fluorine atoms located at 2.30±0.01 A ̊, 8 barium and 4 uranium atoms at 4.36 ±0.02 ...
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