Relationship between lithium content and ionic conductivity in the Li5+2xLa3Nb2−xScxO12 system (original) (raw)

The Al-free cubic garnet-like Li 5+2x La 3 Nb 2-x Sc x O 12 series with x = 0-0.75 was successfully synthesized by solid state reaction. Final sintering at 1150 °C for 12 h in a magnesia crucible with the mother powder method resulted in stoichiometric single phases that corresponded to each nominal composition. The relationship between the lithium content and ionic conductivity was investigated for each composition. The conductivity of the samples showed a positive dependency on the Li content and the optimum Li content for Li conduction was 6.25-6.5 in the formula unit. The highest bulk conductivity of 3.70×10-4 S cm-1 was observed for x = 0.625 at 25 °C and that for x = 0.75 at 50 °C was 6.05×10-4 S cm-1 .