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Solid state synthesis of extra phase-pure Li4Ti5O12 spinel

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Author(s): Veljković I. | Poleti D. | Karanović Lj. | Zdujić M. | Branković G.

Journal: Science of Sintering
ISSN 0350-820X

Volume: 43;
Issue: 3;
Start page: 343;
Date: 2011;
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Keywords: X-ray diffraction | mechanism | thermal stability | Li4Ti5O12 | spinel | phase-pure

ABSTRACT
Extra phase-pure Li4Ti5O12 spinel with particle sizes less than 500 nm was synthesized by solid state reaction of mechanochemicaly activated mixture of nano anatase and Li2CO3 for a very short annealing time, 4 h at 800°C. Structural and microstructural properties, the mechanism of solid state reaction between anatase and Li2CO3 as well as thermal stability of prepared spinel were investigated using XRPD, SEM and TG/DSC analysis. The mechanism of reaction implies decomposition of Li2CO3 below 250ºC, formation of monoclinic Li2TiO3 as intermediate product between 400 and 600°C and its transformation to Li4Ti5O12 between 600-800ºC. The spinel structure is stable up to 1000ºC when it is decomposed due to Li2O evaporation.

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