0.95BaTiO(3)-0.05(Bi0.5Na0.5)TiO3 ceramics with a positive temperature coefficient of resistivity (PTCR) were fabricated by a modified synthesis process. Their structural and PTCR characteristics were investigated by varying the (Bi0.5Na0.5)TiO3-rich BaTiO3(Bi0.5Na0.5)TiO3 intermediate composition in the additional step. For the specimen with the intermediate step composition of 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO(3), abnormally large grains grew with the aid of the liquid phase that developed due to the volatile Bi during sintering at 1300 degrees C. Especially, it showed enhanced PTCR characteristics with a PTCR jump of 1.1 x 10(4), temperature coefficient of resistivity of 41%/degrees C, and low resistivity at room temperature of 1.6 x 10(2) Omega cm caused by its large grain boundary volume compared to the specimen fabricated by the normal synthesis process. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3514599] All rights reserved.