Issue 12, 2012
From the journal:

RSC Advances

Size-dependent phase transitions in nanostructured zirconia–scandia solid solutions†

Paula M. Abdala,*ab   Aldo F. Craievichc  and  Diego G. Lamasd  

* Corresponding authors

a Swiss-Norwegian Beam Lines, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, Grenoble, France
E-mail: abdala@esrf.fr
Fax: +33 4 76 88 26 94
Tel: +33 4 76 88 29 02

b CINSO (CONICET-CITEDEF), J.B. de La Salle 4397 (1603) Villa Martelli, Pcia de Buenos Aires, Argentina

c Instituto de Física, FAP, USP, Travessa R da Rua do Matão, no.187, Cidade Universitária, São Paulo, Brazil
E-mail: craievich@if.usp.br

d Laboratorio de Caracterización de Materiales, Facultad de Ingeniería, Universidad Nacional del Comahue, Pcia. de Neuquén, Argentina and CONICET, (8300) Neuquén Capital, Buenos Aires 1400, Argentina
E-mail: diego.lamas@fain.uncoma.edu.ar

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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Article information

DOI
https://doi.org/10.1039/C2RA20512B
Article type
Paper
Submitted
20 Mar 2012
Accepted
21 Mar 2012
First published
22 Mar 2012

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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