Synthesis of uranium mixed anion compounds synthesized using the Boron-Chalcogen Mixture method: Ba6Co6U0·91S13·5O0.5 and Ba5·47K0·53Zn6US13·5O0.5

Mixed anion compounds have exhibited interesting structures and properties that differ from compounds only incorporating a single anion in their composition. Unfortunately, difficulties in the synthetic methods used to obtain these materials has slowed the evolution of this field, prompting investigations into alternate synthetic pathways to these materials. Our recently establish Boron-Chalcogen Mixture (BCM) method, which was originally developed for the synthesis of pure actinide chalcogenides from oxides, has been adapted to achieve the partial oxide to sulfide conversion of Ba2MUO6 (M = Co, Zn) which resulted in two new uranium (IV/V) oxysulfide compounds, Ba6Co6U0·91S13·5O0.5 and Ba5·47K0·53Zn6US13·5O0.5 These compounds crystallize in the tetragonal crystal system adopting the space group I4/mcm. Their syntheses, crystal structures, and trends observed in the pursuit of these new mixed anion compounds are reported.