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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13034
Title: Structural, thermal and morphological studies of magnesium substituted-lithium manganese oxide spinels
Authors: Singh G.
Sil A.
Ghosh S.
Published in: Physica B: Condensed Matter
Abstract: Coexistence of two phases having space groups of Fd3m and P4332 in the Mg-doped LiMn2O4 spinel is being reported for the first time in this article. Mg-doped LiMn2O4 powders have been synthesized by sol-gel method using citric acid as a chelating agent. X-ray powder diffraction (XRD) studies show that the crystal structure of LiMgxMn2-xO4 for x<0.25 is a single-phase cubic spinel, which has space group of Fd3m. The cubic spinel structures having space group of Fd3m and P4332 are found to coexist in the compound for x=0.25. The structure becomes single-phase cubic spinel with space group P4332 for x>0.25. Field emission scanning electron microscopy (FESEM) shows that particle size of various synthesized powders ranges from 100 to 350 nm. Particle size decreases with increase in Mg content. Differential thermal analysis (DTA) and thermogravimetry (TG) studies show an exponential decay relationship between Mg-doping content and the decomposition temperature to form nonstoichiometry (LiMgxMn2-xO4-δ) in air atmosphere. Fourier transform infrared spectroscopy (FTIR) analysis shows increase in the number of vibrational bands with increase in Mg content, which indicates ordering of the ions in the case of ordered spinel structure, and consequent reduction of the space group symmetry from Oh7 to O7. © 2009 Elsevier B.V. All rights reserved.
Citation: Physica B: Condensed Matter (2009), 404(20): 3807-3813
URI: https://doi.org/10.1016/j.physb.2009.06.148
http://repository.iitr.ac.in/handle/123456789/13034
Issue Date: 2009
Keywords: Ceramic
Crystal structure
Thermogravimetric analysis (TGA)
X-ray diffraction
ISSN: 9214526
Author Scopus IDs: 57209690740
7003754102
57209784811
Author Affiliations: Singh, G., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Ghosh, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India
Corresponding Author: Sil, A.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India; email: anj_sil@yahoo.co.uk
Appears in Collections:Journal Publications [MT]

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