Chinese Physics C > 2013, Vol. 37 > Issue(9): 098003 DOI: 10.1088/1674-1137/37/9/098003

Study of high pressure structural stability of CeO₂nanoparticles

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Abstract：
In situ high pressure XRD diffraction and Raman spectroscopy have been performed on 12 nm CeO ₂nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO ₂nanoparticles maintain the fluorite-type structure in the whole pressure range (0-51 GPa) during the experiments, much more stable than the bulk counterpart ( P _T～31 GPa). In contrast, they experienced phase transition at pressure as low as 26 GPa under non-hydrostatic conditions (adopting CsCl as pressure medium). Additionally, 32-36 nm CeO ₂nanoparticles exhibit an onset pressure of phase transition at 35 GPa under quasihydrostatic conditions, and this onset pressure is much lower than our result. Further analysis shows both the experimental condition (i.e., quasihydrostatic or non-hydrostatic) and grain size effect have a significant impact on the high pressure behaviors of CeO ₂nanomaterials.

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LIU Bo, LIU Ran, LI Quan-Jun, YAO Ming-Guang, ZOU Bo, CUI Tian, LIU Bing-Bing and LIU Jing. Study of high pressure structural stability of CeO ₂nanoparticles[J]. Chinese Physics C, 2013, 37(9): 098003. doi: 10.1088/1674-1137/37/9/098003

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Received: 2012-10-26
Revised: 2012-12-18

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of high pressure structural stability of CeO₂nanoparticles

Corresponding author:LIU Bing-Bing,

Received Date:2012-10-26

Accepted Date:2012-12-18

Available Online:2013-09-05

Abstract:In situ high pressure XRD diffraction and Raman spectroscopy have been performed on 12 nm CeO₂nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO₂nanoparticles maintain the fluorite-type structure in the whole pressure range (0-51 GPa) during the experiments, much more stable than the bulk counterpart (P_T～31 GPa). In contrast, they experienced phase transition at pressure as low as 26 GPa under non-hydrostatic conditions (adopting CsCl as pressure medium). Additionally, 32-36 nm CeO₂nanoparticles exhibit an onset pressure of phase transition at 35 GPa under quasihydrostatic conditions, and this onset pressure is much lower than our result. Further analysis shows both the experimental condition (i.e., quasihydrostatic or non-hydrostatic) and grain size effect have a significant impact on the high pressure behaviors of CeO₂nanomaterials.

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Study of high pressure structural stability of CeO₂nanoparticles

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