Lithium conducting glass ceramic with Nasicon structure

Abstract Lithium ion conducting glass and glass ceramic of the composition Li 1.4 [Al 0.4 Ge 1.6 (PO 4 ) 3 ], have been synthesized. The monolithic glass pieces on thermal treatment resulted in single-phase glass ceramic with the Nasicon structure. Experiments with different electrodes proved that the lithium electrodes provide accurate values for the ionic conductivity using impedance spectroscopy. σ ionic of the glass ceramic was found to be 3.8×10 −5 S cm −1 at 40°C with an activation energy ( E a ) of 0.52 eV. The corresponding values for the glass are 2.7×10 −9 S cm −1 and 0.95 eV, respectively. The Arrhenius dependence of σ ionic with temperature in glass and glass ceramic is interpreted with a hopping mechanism from which the microscopic characteristics of the lithium cation motion are deduced.