Mn3-xZnxO4 spinel phases in the Zn-Mn-O system

The thermal evolution of the Zn-Mn-O system in air was studied by X-ray diffraction, transmission electron microscopy-energy dispersive spectroscopy and electron energy loss spectroscopy. The obtained results suggest that this evolution involves the formation of different Mn3-xZnxO4 spinel-type phas...

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Bibliographic Details
Published in:Acta materialia 2008-09, Vol.56 (15), p.4028-4035
Main Authors: PEITEADO, M, STURM, S, CABALLERO, A. C, MAKOVEC, D
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Metals. Metallurgy
Online Access:Get full text
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Summary:The thermal evolution of the Zn-Mn-O system in air was studied by X-ray diffraction, transmission electron microscopy-energy dispersive spectroscopy and electron energy loss spectroscopy. The obtained results suggest that this evolution involves the formation of different Mn3-xZnxO4 spinel-type phases. With increasing temperature these spinels experience phase transformations which are found to be induced by the Mn(IV) to Mn(III) reduction process. This last cation is an active Jahn-Teller ion which leads to an appreciable distortion of the Mn3-xZnxO4 spinel structure, from a cubic symmetry at low temperatures to highly distorted tetragonal symmetries at high temperatures.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.04.024