Study of high pressure structural stability of CeO<SUB>2</SUB> nanoparticles

LIU Bo; LIU Ran; LI Quan-Jun; YAO Ming-Guang; ZOU Bo; CUI Tian; LIU Bing-Bing; LIU Jing

doi:10.1088/1674-1137/37/9/098003

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

Study of high pressure structural stability of CeO₂ nanoparticles

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Abstract：
In situ high pressure XRD diffraction and Raman spectroscopy have been performed on 12 nm CeO₂ nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO₂ nanoparticles 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 CeO₂ nanoparticles 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 CeO₂ nanomaterials.

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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 CeO₂ nanoparticles[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 CeO₂ nanoparticles

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 CeO₂ nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO₂ nanoparticles 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 CeO₂ nanoparticles 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 CeO₂ nanomaterials.

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Study of high pressure structural stability of CeO2 nanoparticles

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Study of high pressure structural stability of CeO2 nanoparticles

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Study of high pressure structural stability of CeO₂ nanoparticles

Study of high pressure structural stability of CeO₂ nanoparticles