Microstructural and electrochemical study of La0.5Li0.5TiO3

• Published in: Materials chemistry and physics Vol. 127; no. 1-2; pp. 51 - 55
• Main Authors: Antoniassi, B, Gonzalez, A H M, Fernandes, S L, Graeff, C F O
• Format: Journal Article
• Language: English
• Published: 16-05-2011
• Subjects: Crystal structure; Crystallization; Diffraction; Field emission; Microstructure; Morphology; Perovskites; Phase (cyclic); Polymeric precursors; Precursors; Reduction; Thermal evolution; Voltammetry
• ISSN: 0254-0584
• DOI: 10.1016/j.matchemphys.2010.12.021

La0.50Li0.50TiO3 powder was synthesised by the polymeric precursor method. The precursor powder was heated from 350 C to 700 C and its thermal evolution was studied by Raman spectroscopy. The crystallisation process of the powder was analysed by XRD. Rietveld analysis identified a highly crystalline perovskite phase during crystallisation. However, a secondary phase, LiTi2O4, was also detected. The morphology of the powder was observed by FEG-SEM, which revealed a microstructure of spherical and homogeneous grains. Chronopotentiometry was used to construct charge-discharge curves, and the reduction/oxidation processes were evaluated by cyclic voltammetry. The results gave evidence of two different steps, which indicates the presence of two different kinetic processes.