Effects of burial powder configuration on the microstructure, composition, and ion conductivity of perovskite Li ₃ <i> _x </i> La _1/3‐ <i> _x </i> TaO ₃ ion conductors

A combustion synthesis methodology for the preparation of perovskite Li3xLa1/3-xTaO3 lithium-ion conductors with x = 0.033 is presented. Bulk ceramic specimens were sintered under combinations burial powder and cover crucibles to provide different lithium vapor overpressure conditions. maximum total ion conductivity 6 × 10-6 S cm-1 at room temperature was found pellet covered by a crucible whose lip sealed using parent (moderate overpressure), agreement in intergranular conductivity. Intragranular maximized low condition. The trend correspond content samples through combination nuclear reaction analysis energy dispersive X-ray spectroscopy phase constitution measurements. mechanism impacting determined be changes amount LaTaO4 secondary as driven processing conditions during sintering.