Abstract:Raman spectroscopy is very sensitive to the U‐O bonding strength changes under high pressure, and it could reveal important information about the bonding and stoichiometry of the U‐O systems. The pressure and temperature (P–T) phase diagram of U3O8 was investigated by Raman spectroscopy via four independent P–T experimental paths. The phase boundaries between different phases have been determined by the changes in Raman spectra. A new phase (α′‐U3O8) was observed below 233 K at 0.6 GPa or 198 K at zero pressur… Show more
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