Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 468, Issue 1-2, Pages 258-262Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.12.072
Keywords
Electrode materials; Nanostructured materials; Chemical synthesis; Optical properties
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Funding
- DRDO
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Lithium titanate (Li4Ti5O12) powder has been synthesized by a novel aqueous combustion process using a common amino acid alanine, as fuel. Thermogravimetric analysis of the gel indicates sharp single step combustion at similar to 200 degrees C where nearly 80% weight loss occurs. X-ray analysis shows that the as-synthesized powder contains mostly spinel Li4Ti5O12 phase along with anatase TiO2. About 90% phase purity is obtained when calcined at 800 degrees C in air. Observation Under a Field Emission Scanning Electron Microscope reveals spherical shaped particles with uniform morphology. The particle size as estimated from the micrograph is in the range 40-80 nm. Fourier transformed infrared spectroscopy shows the characteristics bands of Li4Ti5O12 at 652 and 462cm(-1) even in the as-synthesized powder. A wide optical band gap of 1.80eV has been determined from UV-vis spectroscopy. (C) 2007 Elsevier B.V. All rights reserved.
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