Reeves, N., Sharp, J., Beltran Mir, H. et al. (2 more authors) (2016) Spinel–rock salt transformation in LiCoMnO4−δ. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 472 (2185). ISSN 1364-5021
Abstract
The transformation on heating LiCoMnO4, with a spinel structure, to LiCoMnO3, with a cation-disordered rock salt structure, accompanied by loss of 25% of the oxygen, has been followed using a combination of diffraction, microscopy and spectroscopy techniques. The transformation does not proceed by a topotactic mechanism, even though the spinel and rock salt phases have a similar, cubic close-packed oxygen sublattice. Instead, the transformation passes through two stages involving, first, precipitation of Li2MnO3, leaving behind a Li-deficient, Co-rich non-stoichiometric spinel and, second, rehomogenization of the two-phase assemblage, accompanied by additional oxygen loss, to give the homogeneous rock salt final product; a combination of electron energy loss spectroscopy and X-ray absorption near edge structure analyses showed oxidation states of Co2+ and Mn3+ in LiCoMnO3. Subsolidus phase diagram determination of the Li2O-CoOx-MnOy system has established the compositional extent of spinel solid solutions at approximately 500°C.
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/ by/4.0/, which permits unrestricted use, provided the original author and source are credited. | ||||
Keywords: | LiCoMnO4; Rietveld; electron energy loss spectroscopy; x-ray absorption near edge structure; Raman; oxygen loss | ||||
Dates: |
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Institution: | The University of Sheffield | ||||
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) | ||||
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 22 Jan 2016 12:59 | ||||
Last Modified: | 22 Jan 2016 12:59 | ||||
Published Version: | http://dx.doi.org/10.1098/rspa.2014.0991 | ||||
Status: | Published | ||||
Publisher: | Royal Society, The | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1098/rspa.2014.0991 | ||||
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