Crystalline phase content and ionic conductivity correlation in LATP glass-ceramic

Li2O-Al2O3-TiO2-P2O5 (LATP) glass was fabricated by conventional melt quenching route. Glass transition temperature (T (g) = 296 A degrees C) and crystallization temperatures (T (C1,2)) were obtained from thermal analysis. LATP glass was converted to glass-ceramic by heat treatment in the range 550-950 A degrees C for 6 h. X-ray diffraction analysis revealed LiTi2(PO4)(3) as a major phase. Ionic conductivity increased monotonically with concentration, reaching a maximum of similar to 10(-4) S/cm. AlPO4 phase was detected in samples heat-treated above 850 A degrees C. Its presence decreased the conductivity, suggesting LiTi2(PO4)(3) phase as main contributor to high ionic conductivity. NMR spectra confirmed the presence of mobile Li-7 ions in the entire sample series and also gave some information on the structure and dynamics of conductivity