Influence of Fe2O3 on non-isothermal crystallization kinetics and microstructure of lithium titanium phosphate glass-ceramics

Abstract The crystallization behavior and microstructure of Li 2 O–TiO 2 –P 2 O 5 –Fe 2 O 3 glass-ceramic were investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Crystallization kinetic parameters including the activation energy for crystallization (E c ) and the Avrami exponent (n) were also measured. The activation energy for crystallization was found to be 656 kJ/mol and 295 kJ/mol, respectively, in the Fe 2 O 3 -free and 5 weight ratio Fe 2 O 3 containing glasses. The FTIR spectra revealed a strong band due to the influence of Fe 2 O 3 content on different phosphate groups. Impedance spectroscopy studies suggest that the ionic conductivity of the glass-ceramics containing the optimized Fe 2 O 3 content has been improved as compared with the Fe 2 O 3 free one. According to the obtained results, LiTi 2 (PO 4 ) 3 precipitated as near spherical and pyramid-like crystals.