Abstract
Five mixed metal oxalates of lanthanides and uranium of the formula (NH 4)Ln IIIU IV(C 2O 4) 4·8H 2O were prepared and characterised by chemical, infrared spectroscopy, X-ray diffraction and thermal methods. The X-ray powder diffraction data of all the compounds were indexed on an orthorhombic unit cell. Thermal decomposition of the compounds proceeded with the loss of water molecules below 475 K followed by decomposition in the temperature range of 625 to 655 K to give Ln 2O 2CO 3 and UO 2+ x as intermediate products. The intermediate products reacted above 975 K to form solid solutions of mixed oxides having a fluorite structure. Activation energy values were derived for the dehydration of lanthanum and terbium compounds. Lattice parameters of the fluorite phases of the mixed oxides formed by heating the compounds in air, argon and N 2 H 2 have been determined.
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.
