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Title: Phases in ceria-zirconia binary oxide (1-x)CeO2-xZrO2 nanoparticles: the size effects

Abstract

The phases of ceria-zirconia nanoparticles observed in air are studied as a function of particle size and composition by X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The emergence of two tetragonal phases t{prime}{prime} and t monotonically moves toward higher zirconia concentrations with decreasing particle size. A smaller particle size increases the solubility of zirconia in cubic ceria, while higher zirconia content in ceria stabilizes against coarsening. In particular, the cubic Ce{sub 1-x}Zr{sub x}O{sub 2-y} is persistent and is 8% in phase amount even at 90% zirconia with 33 nm crystal size. Neither the monoclinic phase m nor the tetragonal phase t{prime} is observed in the present nanoparticles (<40 nm). The effectiveness of these nanoparticles as oxygen source-and-sink in catalytic support is largely due to the persistence of the cubic and the t{prime}{prime} phases.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914064
Report Number(s):
BNL-78632-2007-JA
Journal ID: ISSN 0002-7820; JACTAW; TRN: US0801513
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Am. Ceram. Soc.; Journal Volume: 80; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; AIR; OXIDES; OXYGEN; PARTICLE SIZE; RAMAN SPECTROSCOPY; SOLUBILITY; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; NSLS; national synchrotron light source

Citation Formats

Zhang,F., Chen, C., Hanson, J., Herman, I., and Chan, S. Phases in ceria-zirconia binary oxide (1-x)CeO2-xZrO2 nanoparticles: the size effects. United States: N. p., 2006. Web. doi:10.1111/j.1551-2916.2005.00788.x.
Zhang,F., Chen, C., Hanson, J., Herman, I., & Chan, S. Phases in ceria-zirconia binary oxide (1-x)CeO2-xZrO2 nanoparticles: the size effects. United States. doi:10.1111/j.1551-2916.2005.00788.x.
Zhang,F., Chen, C., Hanson, J., Herman, I., and Chan, S. Sun . "Phases in ceria-zirconia binary oxide (1-x)CeO2-xZrO2 nanoparticles: the size effects". United States. doi:10.1111/j.1551-2916.2005.00788.x.
@article{osti_914064,
title = {Phases in ceria-zirconia binary oxide (1-x)CeO2-xZrO2 nanoparticles: the size effects},
author = {Zhang,F. and Chen, C. and Hanson, J. and Herman, I. and Chan, S.},
abstractNote = {The phases of ceria-zirconia nanoparticles observed in air are studied as a function of particle size and composition by X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The emergence of two tetragonal phases t{prime}{prime} and t monotonically moves toward higher zirconia concentrations with decreasing particle size. A smaller particle size increases the solubility of zirconia in cubic ceria, while higher zirconia content in ceria stabilizes against coarsening. In particular, the cubic Ce{sub 1-x}Zr{sub x}O{sub 2-y} is persistent and is 8% in phase amount even at 90% zirconia with 33 nm crystal size. Neither the monoclinic phase m nor the tetragonal phase t{prime} is observed in the present nanoparticles (<40 nm). The effectiveness of these nanoparticles as oxygen source-and-sink in catalytic support is largely due to the persistence of the cubic and the t{prime}{prime} phases.},
doi = {10.1111/j.1551-2916.2005.00788.x},
journal = {J. Am. Ceram. Soc.},
number = 3,
volume = 80,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}