Microscopic Characterization of Uranium Nitrides Synthesized by Oxidative Ammonolysis of Uranium Tetrafluoride

摘要: The oxidative ammonolysis route was used to synthesize three uranium nitrides, UN2, U2N3, and UN, using UF4 as the starting material. Powder XRD analysis showed UN2 U2N3 products contain less than 1.0 wt % oxides. UO2 level identified be 5.0 (0) in UN product it is made, but this increases upon exposure air. morphology of these nitrides studied with SEM, while microstructures were investigated by TEM techniques for first time. An explicit microstructural characterization also presented. These characterizations that has a long-range order its structure bulk impurities present on microparticle surface, likely originating from minute oxygen inert atmosphere cover gas and/or diffusion through quartz reactor tube at high temperatures. Surface area measurements demonstrated 10-fold increase surface during step, 0.03 0.26 m2/g, mini...