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Atomistic simulation and ab initio study of the defect structure of spinel-related Li0.5-0.5xMgxFe2-0.5xO4

Widatallah, H. M.; Moore, E. A.; Babo, A. A.; Al-Barwani, M. S. and Elzain, M. (2012). Atomistic simulation and ab initio study of the defect structure of spinel-related Li0.5-0.5xMgxFe2-0.5xO4. Materials Research Bulletin, 47(12) pp. 3995–4000.

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The position of magnesium ions in Mg2+ -doped lithium ferrite of the composition Li0.5 0.5xMgxFe2.5- 0.5xO4, which has been a matter of uncertainty among some experimentalists, is investigated using interatomic potential and ab initio DFT calculations. Among possible 19 defect structure models, some of which have been reported experimentally, the lowest energy is found for Mg2+ ions evenly replacing Li+ and Fe3+ ion on octahedral sites. This gives a decrease in magnetisation for the Mg2+ -doped ferrite relative to the un-doped lithium ferrite. The results suggest that some experimental observations of increased magnetisation of spinel lithium ferrite on Mg2+-doping could be due to substitution of Mg2+ or Li+ on tetrahedral sites at the high temperatures used in preparation of the solid and/or as the presence of undetected defects in the initial precursors.

Item Type: Journal Article
Copyright Holders: 2012 Elsevier Ltd.
ISSN: 0025-5408
Keywords: inorganic compounds; ceramics; crystal structure
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Biomedical Research Network (BRN)
Item ID: 34270
Depositing User: Elaine Moore
Date Deposited: 05 Sep 2012 15:14
Last Modified: 18 Jan 2016 15:38
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