Anomalous quasihydrostaticity and enhanced structural stability of 3 nm nanoceria

    Authors

    Z. W. Wang; S. Seal; S. Patil; C. S. Zha;Q. Xue

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    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

    Language

    English

    First Page

    11756

    Last Page

    11759

    WOS Identifier

    WOS:000248658600003

    ISSN

    1932-7447

    Share

    COinS