1 Ocak 2015 Dergi makalesi Açık Erişim

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

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    <subfield code="a">Size dependent compressibility of nano-ceria: Minimum near 33 nm</subfield>
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    <subfield code="a">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. (C) 2015 AIP Publishing LLC.</subfield>
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    <subfield code="u">Columbia Univ, Dept Appl Phys &amp; Appl Math, Mat Sci &amp; Engn Program, New York, NY 10027 USA</subfield>
    <subfield code="a">Song, Junhua</subfield>
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