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Structure and optical absorption of combustion-synthesized nanocrystalline LiCoO2

Published online by Cambridge University Press:  03 March 2011

Paromita Ghosh ,
S. Mahanty ,
M.W. Raja ,
R.N. Basu  and
H.S. Maiti
Paromita Ghosh
Affiliation:
Fuel Cell and Battery Section, Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
S. Mahanty
Affiliation:
Fuel Cell and Battery Section, Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
M.W. Raja
Affiliation:
Fuel Cell and Battery Section, Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
R.N. Basu*
Affiliation:
Fuel Cell and Battery Section, Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
H.S. Maiti
Affiliation:
Fuel Cell and Battery Section, Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
*
a) Address all correspondence to this author. e-mail: rnbasu@cgcri.res.in
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Abstract

Nanocrystalline LiCoO2 powders (10–50 nm) were synthesized by a citrate-nitrate combustion process followed by calcination at different temperatures (300–800 °C) in air. Thermogravimetric analyses indicated a sharp combustion at a low temperature of 225 °C, producing fine crystallites. Quantitative phase analyses from the x-ray diffractograms showed that while annealing at 500 °C produced mixed phases of cubic and rhombohedral LiCoO2, annealing at 800 °C resulted in single-phase rhombohedral LiCoO2. Electronic transitions related to the Co 3d bands were investigated by ultraviolet-visible reflectance spectra in absorbance mode and were ascribed to the Co 3d intra-band transition involving t2g and eg orbitals. The d-d transitions underwent a blue shift of about 0.3 eV as the cubic LiCoO2 transformed into the rhombohedral structure with band gap values of about 1.4 and 1.7 eV.

Keywords

Crystallographic structureLiOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1162 - 1167
Copyright
Copyright © Materials Research Society 2007

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