Synthesis and crystal structure investigations of ternary oxides in the Na-Pu-O system

Ternary oxides of sodium and plutonium in oxidation states from +4 to +7 have been synthesized by solid state reactions at elevated temperatures in pure argon or oxygen atmospheres. Crystal structures of the obtained phases have been investigated by the Rietveld method using conventional X-ray powder diffraction technique. The structural analogs were found among the families of complex oxides of alkali elements and cerium, ruthenium, antimony, uranium/neptunium and osmium. The new results were compared to earlier literature data for the Na-Pu-O system.