Title
Anomalous quasihydrostaticity and enhanced structural stability of 3 nm nanoceria
Abbreviated Journal Title
J. Phys. Chem. C
Keywords
CERIUM OXIDE; SOLID HELIUM; SIZE; NANOPARTICLES; NANOCRYSTALS; CRYSTAL; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary
Abstract
High-pressure ruby fluorescence spectroscopy and synchrotron X-ray diffraction are used to investigate the differential stress development and structural stability of 3 nm ceria. Upon compression of nanoceria to similar to 28.2 GPa, R-1 and R-2 lines of ruby remain consistent in shape and sharpness. X-ray diffraction displays no reasonable evidence of peak broadening to 28.6 GPa and phase transformation to 65.1 GPa. These observations suggest an anomalous quasihydrostatic state of compressed nanoceria and a highly enhanced structural stability. Although a pressure-driven oxygen release and subsequent vacancy-induced interface superfluid reasonably explains the generation of extended quasihydrostaticity, a particle size dependent isotropic stress field and surface energy contribution to total energy explain a reversal of structural stability as compared to the size-induced reduction of transformation pressure in large scale nanoceria. These findings provide significant information not only for understanding the reversed Hall-Petch relation of nanomaterials but also for synthesizing engineering materials with tunable mechanical properties.
Journal Title
Journal of Physical Chemistry C
Volume
111
Issue/Number
32
Publication Date
1-1-2007
Document Type
Letter
DOI Link
Language
English
First Page
11756
Last Page
11759
WOS Identifier
ISSN
1932-7447
Recommended Citation
"Anomalous quasihydrostaticity and enhanced structural stability of 3 nm nanoceria" (2007). Faculty Bibliography 2000s. 7775.
https://stars.library.ucf.edu/facultybib2000/7775
Comments
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