A typical approach involving Pechini method and spark plasma sintering (SPS) method was presented for the preparation of high density Li5+xSrxLa3--xBi2O12 (x = 0, 1) ceramics. Phase formation, microstructure, grain size and electrical properties of the specimens were examined using XRD, SEM and alternating current impedance spectroscopy (ACIS). Dense Li5La3Bi2O12 and Li6SrLa2Bi2O12 ceramics with pure garnet-like phase, relative density of 97% and average grain size of about 5 μm were fabricated using this approach. The total conductivities at 298 K of Li5La3Bi2O12 and Li6SrLa2Bi2O12 ceramics prepared by the SPS method are 5.1×10-5 and 6.8×10-5 S/cm, respectively, 2 times higher than that of samples prepared by the conventional sintering method.
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