Low-temperature synthesis of Li7La3Zr2O12 with cubic garnet-type structure

Abstract In this paper, we report the direct synthesis of Li 7 La 3 Zr 2 O 12 with the cubic garnet-type structure at low temperature with a lattice constant of 13.0035 A. The synthesis condition is optimized to be at 750 °C for 8 h with 30 wt% excess lithium salt. No intermediate grinding was involved in this straightforward route. Without the adventitious of Al 3+ , the cubic Li 7 La 3 Zr 2 O 12 is unstable above 800 °C and has an ionic conductivity of the order of 10 −6 S cm −1 .