Synthese et structure d'un bronze oxygene quadratique contenant de l'uranium a la valence six

Abstract

(Nb 7.6U 2.4)(Ba 5.2K 0.8)O 30 is a quadratic bronze with space group P4 bm and lattice parameters a = 12.608(5) and c = 4.012(2) A ̊ , Z = 1. The structure of a single crystal was refined to R= 0.056 ( R w = 0.072) for 967 independent reflections with I ⩾ 3 σI. The U 6+ ion is located inside octahedral sites with Nb 5+ and Nb 4+.