ChemInform Abstract: High‐Pressure U₃O₈ with the Fluorite‐Type Structure.

Abstract

High-Pressure U 3O8 with the Fluorite-Type Structure. -A dense fluorite-like form of U 3O8 is prepared from -U3O8 at pressures greater than 8.1 GPa. The high-pressure phase crystallizes in the space group Fm3m (in situ XRD) and is stable at pressures at least up to 40 GPa and temperatures up to 1700 K. It is quenchable to ambient conditions. The quenched high-pressure phase is 28% denser than the initial orthorhombic phase at ambient conditions. -(ZHANG*, F. X.; LANG, M.; WANG, J. W.; LI, W. X.; SUN, K.; PRAKAPENKA, V.; EWING, R. C.; J. Solid State Chem. 213 (2014) 110-115, http://dx.