Preparation and electrical characterization of NASICON-type compound, Li1.3Ge1.4Ti0.3Al0.3(PO4)(3), are described. The solid solution is obtained with Ge4+ -> Ti4+ and Ge4+ -> Al3+ substitutions in LiGe2(PO4)(3). The powder has been fabricated by a solid state reaction and the structural characteristics of it have been studied by X-ray. Ceramic samples have been sintered by varying the sintering duration from 1 to 3 h. Samples were studied by complex impedance spectroscopy in the frequency range 1 MHz-1.2 GHz and temperature range 300-600 K. Two regions of relaxation dispersion were found. The dispersions were related to the fast Li+ ion transport in the grains and grain boundaries. Variation of the sintering duration has no considerable effect on electrical properties of the ceramics. (c) 2006 Elsevier Ltd. All rights reserved.