Influence Of Citrate/nitrate Ratio On The Preparation Of Li 0.5la0.5tio3 Nanopowder By Combustion Method

Preparation of nano-crystalline Li0.5La0.5TiO 3 perovskite material using citrate-nitrate redox reaction by the combustion technique is reported. The role of the ammonium nitrate concentration used to co-precipitate the Li0.5La0.5Ti-citrate precursor is revealed by ATD/TG, XRD, SEM-EDX and HRTEM techniques. Thermo-gravimetric analysis data show how the intensity of the exothermic peak associated with the citrate-nitrate redox reaction decreases until disappearance as the citrate/nitrate molar ratio increases. The XRD study indicates that a single-phase cubic Li0.5La0.5TiO3 phase is formed at 350 C when the citrate/nitrate ratio varies between 0.13 and 0.17. The formed Li0.5La0.5TiO3 powders show an average particle size of 15-20 nm. Electrochemical impedance spectroscopy technique reveals a relative high ionic conductivity inside the grain for the nanometric Li0.5La0.5TiO3 material, with values of around 10-4 S/cm at room temperature. © 2013 Elsevier Ltd and Techna Group S.r.l. 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