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Issue 12, 2012
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Size-dependent phase transitions in nanostructured zirconia–scandia solid solutions

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Abstract

The dependences of phase stability and solid state phase transitions on the crystallite size in ZrO2-10, 12 and 14 mol% Sc2O3 nanopowders are investigated by X-ray powder diffraction using a synchrotron source (S-XPD). The average crystallite sizes lie within the range of 35 to 100 nm, approximately. At room temperature these solid solutions were previously characterised as mixtures of a cubic phase and one or two rhombohedral phases, β and γ, with their fractions depending on composition and average crystallite sizes. In this study, it is shown that at high temperatures these solid solutions become cubic single-phased. The size-dependent temperatures of the transitions from the rhombohedral phases to the cubic phase at high temperature are determined through the analyses of a number of S-XPD patterns. These transitions were studied on cooling and on heating, exhibiting hysteresis effects whose relevant features are size and composition dependent.

Graphical abstract: Size-dependent phase transitions in nanostructured zirconia–scandia solid solutions

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Publication details

The article was received on 20 Mar 2012, accepted on 21 Mar 2012 and first published on 22 Mar 2012


Article type: Paper
DOI: 10.1039/C2RA20512B
Citation: RSC Adv., 2012,2, 5205-5213
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    Size-dependent phase transitions in nanostructured zirconia–scandia solid solutions

    P. M. Abdala, A. F. Craievich and D. G. Lamas, RSC Adv., 2012, 2, 5205
    DOI: 10.1039/C2RA20512B

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