High-pressure U3O8 with the fluorite-type structure
A new high-pressure phase of U3O8, which has a fluorite-type structure, forms at pressures greater than ~8.1 GPa that was confirmed by in situ x-ray diffraction (XRD) measurements. The fluorite-type U3O8 is stable at pressures at least up to ~40 GPa and temperatures to 1700 K, and quenchable to ambient conditions. Based on the XRD analysis, there is a huge volume collapse (>20%) for U3O 8 during the phase transition and the quenched high-pressure phase is 28% denser than the initial orthorhombic phase at ambient conditions. The high-pressure phase has a very low compressibility comparing with the starting orthorhombic phase. © 2014 Elsevier Inc.
Publication Source (Journal or Book title)
Journal of Solid State Chemistry
Zhang, F., Lang, M., Wang, J., Li, W., Sun, K., Prakapenka, V., & Ewing, R. (2014). High-pressure U3O8 with the fluorite-type structure. Journal of Solid State Chemistry, 213, 110-115. https://doi.org/10.1016/j.jssc.2014.02.012