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|Title:||Structural properties and charge distribution of the sodium uranium, neptunium and plutonium ternary oxides: a combined X-ray diffraction and XANES study.|
|Authors:||SMITH ANNA; MARTIN PHILIPPE; PRIEUR DAMIEN; SCHEINOST ANDREAS; RAISON PHILIPPE; CHEETHAM ANTHONY; KONINGS RUDY|
|Citation:||INORGANIC CHEMISTRY vol. 55 no. 4 p. 1569-1579|
|Publisher:||AMER CHEMICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||The charge distributions in Alpha-Na2UO4, Na3NpO4, Alpha-Na2NpO4, Na4NpO5, Na5NpO6, Na2PuO3, Na4PuO5, and Na5PuO6 are investigated in this work using X-ray Absorption Near-Edge Structure (XANES) spectroscopy at the U-L3, Np-L3, and Pu-L3 edges. In addition, a Rietveld refinement of monoclinic Na2PuO3, in space group C2~c, is re- ported for the first time, and the existence of the isostructural Na2NpO3 phase is revealed. In contrast to measurements in solution, the number of published XANES data for neptunium and plutonium solid phases with a valence state higher than (IV) is very limited. The present results cover a wide range of oxidation states, namely (IV) to (VII), and can serve as reference for future investigations. The sodium actinide series show a variety of local coordination geometries, and correlations between the shape of the XANES spectra and the local structural environments are discussed herein.|
|JRC Directorate:||Nuclear Safety and Security|
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