Effect of Glass Crystallization Conditions on Conductivity of Li_1.5+xAl_0.5Ge_1.5Si_xP_3-xO₁₂ Glass-Ceramics

Glass-ceramic samples of the Li1.5+xAl0.5Ge1.5SixP3-xO12 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 SiO2-doped glass-ceramics were determined. The composition with x = 0.02, obtained by crystallized at 750 degrees C at a heating rate of 3 deg/min for 2 h, had the highest lithium-ion conductivity at room temperature (4.55x10(-4) S/cm).