Abstract
The effects of thermal treatment conditions on ADU (ammonium diuranate) prepared by SOL-GEL method, so-called GSP (Gel supported precipitation) process, were investigated for <TEX>$UO_2$</TEX> kernel preparation. In this study, ADU compound particles were calcined to <TEX>$UO_3$</TEX> particles in air and Ar atmospheres, and these <TEX>$UO_3$</TEX> particles were reduced and sintered in 4%-<TEX>$H_2$</TEX>/Ar. During the thermal calcining treatment in air, ADU compound was slightly decomposed, and then converted to <TEX>$UO_3$</TEX> phases at <TEX>$500^{\circ}C$</TEX>. At <TEX>$600^{\circ}C$</TEX>, the <TEX>$U_3O_8$</TEX> phase appeared together with <TEX>$UO_3$</TEX>. After sintering of theses particles, the uranium oxide phases were reduced to a stoichiometric <TEX>$UO_2$</TEX>. As a result of the calcining treatment in Ar, more reduced-form of uranium oxide was observed than that treated in air atmosphere by XRD analysis. The final phases of these particles were estimated as a mixture of <TEX>$U_3O_7$</TEX> and <TEX>$U_4O_9$</TEX>.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
