Effect of Glass Crystallization Conditions on Conductivity of Li1.5+хAl0.5Ge1.5SixP3–xO12 Glass-Ceramics

Glass-ceramic samples of the Li 1.5+ x Al 0.5 Ge 1.5 Si x P 3– x O 12 system ( x = 0–0.1) were obtained by by glass crystallization. The temperatures of glass transition and of crystallization onset and peak were determined using differential scanning calorimetry. The phase composition of glass-ceramics was determined by X-ray phase analysis. Electrical conductivity was studied using electrochemical impedance. Based on the data obtained, the homogeneity region of solid solutions was established and the optimal conditions for obtaining SiO 2 -doped glass-ceramics were determined. The composition with x = 0.02, obtained by crystallized at 750°C at a heating rate of 3 deg/min for 2 h, had the highest lithium-ion conductivity at room temperature (4.55×10 –4 S/cm).