Size dependent compressibility of nano-ceria

Minimum near 33 nm

Philip P. Rodenbough, Junhua Song, David Walker, Simon M. Clark, Bora Kalkan, Siu Wai Chan*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    We report the crystallite-size-dependency of the compressibility of nanoceria under hydrostatic pressure for a wide variety of crystallite diameters and comment on the size-based trends indicating an extremum near 33 nm. Uniform nano-crystals of ceria were synthesized by basic precipitation from cerium (III) nitrate. Size-control was achieved by adjusting mixing time and, for larger particles, a subsequent annealing temperature. The nano-crystals were characterized by transmission electron microscopy and standard ambient x-ray diffraction (XRD). Compressibility, or its reciprocal, bulk modulus, was measured with high-pressure XRD at LBL-ALS, using helium, neon, or argon as the pressure-transmitting medium for all samples. As crystallite size decreased below 100 nm, the bulk modulus first increased, and then decreased, achieving a maximum near a crystallite diameter of 33 nm. We review earlier work and examine several possible explanations for the peaking of bulk modulus at an intermediate crystallite size.

    Original languageEnglish
    Article number163101
    Pages (from-to)1-5
    Number of pages5
    JournalApplied Physics Letters
    Volume106
    Issue number16
    DOIs
    Publication statusPublished - 20 Apr 2015

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