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CeO 2 undergoes a first‐order phase transition from fluorite to α‐PbCl 2 ‐type structure under high pressure. To evaluate the changes in physical properties of CeO 2 nanomaterials as the particle size decreasing, high‐pressure Raman study under quasi‐hydrostatic condition has been performed on CeO 2 nanospheres self‐assembled by 5 nm CeO 2 nanoparticles at room temperature. Surprisingly, as the pressure elevate to 34 GPa, the CeO 2 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 CeO 2 nanoparticles, which is less stable than the bulk materials. The enhancement of phase stability might be attributed to the increase of surface energy of CeO 2 nanospheres as the size of the building units decrease.
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Liu et al. (2011) studied this question.
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