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Microstructure of single-phase cobalt and manganese oxide spinel Mn3−xCoxO4 ceramics

El Horr, Nahida and Guillemet-Fritsch, Sophie and Rousset, Abel and Bordeneuve, Hélène and Tenailleau, Christophe Microstructure of single-phase cobalt and manganese oxide spinel Mn3−xCoxO4 ceramics. (2014) Journal of the European Ceramic Society, 34 (2). 317-326. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2013.08.010

Abstract

This paper reports microstructural studies of single-phase Mn3−xCoxO4(0.98 ≤ x ≤ 2.93) spinel ceramics using transmission electron microscopy(TEM) and energy dispersive X-ray spectroscopy (EDX). These ceramics were obtained by conventional sintering or by spark plasma sintering(SPS) of powders prepared by thermal decomposition of coprecipitated oxalate precursors. For x < 1.78 or x ≥ 1.78, the monophasic ceramicscorrespond respectively to quadratic (Q) or cubic (C) spinel structure. The ferroelastic character of the structural phase transition from C to Qis highlighted by specific microstructural features. The effect of chemical composition and heat treatment conditions on the microstructure andessentially on the presence and the characteristics of twins were investigated. The coherent twin interfaces are parallel to (1 1 2) planes in the Qcell. Twins can correspond to: tweeds, single lamellae (widths: 5–306 nm) arranged parallel to each other, large lamellae (widths: 69–928 nm)internally twinned and sometimes arranged in cyclic forms (triangular shapes).

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of the European Ceramic Society website : http://www.sciencedirect.com/science/article/pii/S0955221913003683
HAL Id:hal-01164722
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:17 Jun 2015 13:59

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