Title

Anomalous Quasihydrostaticity And Enhanced Structural Stability Of 3 Nm Nanoceria

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 ∼28.2 GPa, R1 and R2 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. © 2007 American Chemical Society.

Publication Date

8-16-2007

Publication Title

Journal of Physical Chemistry C

Volume

111

Issue

32

Number of Pages

11756-11759

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp074909g

Socpus ID

34548241895 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34548241895

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