Thermal decomposition data of uranium containing microspheres produced via internal gelation and ammonium diuranate powder

A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the thermal decomposition behaviour in the NH₃ − UO₃ − H₂O class of materials.

One compound was prepared according to a typical ammonium diuranate precipitation reaction, and could be identified as 3UO₃·NH₃·5H₂O. Microspheres prepared by the sol-gel method via internal gelation were associated to the composition 3UO₃·2NH₃·4H₂O under the specified conditions.

The products were analysed using the techniques listed below, the resulting data are part of this dataset.

• TGA, combined with EGA-MS (T_max = 1300 °C, heating rate = 2 °C/min)
• TG-DSC, combined with EGA-MS (T_max = 1300 °C, heating rate = 10 °C/min)
• ambient XRD (dried products after synthesis)
• in-situ high temperature XRD (including initial and final scans, taken at 35 °C)
  • T_max for 3UO₃·NH₃·5H₂O = 1300 °C; T_max for 3UO₃·2NH₃·4H₂O = 650 °C
  • Samples measured directly on a Pt/Rh heating strip (Pt/Rh phase visible in patterns, blank scan included)