|High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface|
|Liu, B; Yao, MG; Liu, BB; Li, ZP; Liu, R; Li, QJ; Li, DM; Zou, B; Cui, TA; Zou, GT; Liu, J; Chen, Z; Liu J(刘景)
|发表期刊||JOURNAL OF PHYSICAL CHEMISTRY C
; Yao, Mingguang
; Liu, Bingbing
; Li, Zepeng
; Liu, Ran
; Li, Quanjun
; Li, Dongmei
; Zou, Bo
; Cui, Tian
; Zou, Guangtian] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
; [Liu, Jing] Chinese Acad Sci, Inst High Energy Phys, Beijing 100023, Peoples R China
; [Chen, Zhiqiang] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
|摘要||In-situ high-pressure X-ray diffraction and Raman spectroscopies have been performed on well-shaped CeO2 nano-octahedrons enclosed by eight (111) planes. The CeO2 nano-octahedrons are shown to be more stable than their bulk counterparts and some other reported CeO2 nanocrystals of smaller size. The transition pressure from cubic to orthorhombic phase is approximately 10 GPa higher than that of 12 nm CeO2 nanocrystals even though they have similar volume expansion at ambient conditions. Additionally, the phase transition to alpha-PbCl2 phase is very sluggish and uncompleted even up to 55 GPa. The TEM image of the sample after decompression from 55 GPa clearly shows that the nano-octahedrons preserve the starting shape. Such distinct high-pressure behaviors in CeO2 nano-octahedrons have been discussed in terms of their special exposure surface. Further analysis shows that the lower compressibility of the exposed (111) planes in the nano-octahedrons is believed to be the major factor to the elevation of the phase transition pressure and the sluggishness of the transition.|
|学科领域||Chemistry; Science & Technology - Other Topics; Materials Science
; Science & Technology - Other Topics
; Materials Science
; Nanoscience & Nanotechnology
; Materials Science, Multidisciplinary
Liu, B,Yao, MG,Liu, BB,et al. High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2011,115(11):4546-4551.
Liu, B.,Yao, MG.,Liu, BB.,Li, ZP.,Liu, R.,...&刘景.(2011).High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface.JOURNAL OF PHYSICAL CHEMISTRY C,115(11),4546-4551.
Liu, B,et al."High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface".JOURNAL OF PHYSICAL CHEMISTRY C 115.11(2011):4546-4551.