Abstract
AbstractCeO2 undergoes a first‐order phase transition from fluorite to α‐PbCl2‐type structure under high pressure. To evaluate the changes in physical properties of CeO2 nanomaterials as the particle size decreasing, high‐pressure Raman study under quasi‐hydrostatic condition has been performed on CeO2 nanospheres self‐assembled by 5 nm CeO2 nanoparticles at room temperature. Surprisingly, as the pressure elevate to 34 GPa, the CeO2 nanospheres still retain the cubic fluorite‐type structure, indicating the sample is more stable than the bulk counterpart. Whereas, previous high‐pressure studies show the phase transition at 22.3/26.5 GPa for 12 nm CeO2 nanoparticles, which is less stable than the bulk materials. The enhancement of phase stability might be attributed to the increase of surface energy of CeO2 nanospheres as the size of the building units decrease.
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