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Nanocrystalline thoria with average diameters of 9, 15, and 24 nm have been synthesised and their Raman spectra are compared with bulk crystal data in order to establish size-dependent changes to the phonon spectrum at ambient conditions. Micro-Raman spectroscopy has been used to investigate the structural stability of these samples up to pressures of ∼50 GPa in a diamond anvil cell at room temperature...
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