Li0.35La0.55TiO3 (LLTO) powder was mixed with Li7La3Zr2O12 (LLZO) sol and finally sintered into ceramic pellets. In the low-temperature calcined precursor powder. Zr exists in the amorphous phase around LLTO aggregated particles. After high-temperature sintering, the LLZO phase does not exist, whereas Zr is doped into the LLTO grain interior but is richer in the grain boundary. The introduction of LLZO could modify the grain boundary region of the ceramics and thus change its electrical properties. The LLTO-based ceramics sintered at 1350 degrees C with 5 wt.% LLZO sol introduced in the precursor powder exhibit a high total conductivity of about 12 x 10(-4) S/cm at room temperature. (C) 2013 Elsevier B.V. All rights reserved.