As a positive temperature coefficient of resistivity (PTCR) material, (1-x)BaTiO3-x(Bi0.5Na0.5)TiO3 (BT-BNT, 0.01 < x < 0.08) ceramics without any donor doping were prepared by a conventional solid-state reaction method. All samples were sintered in an N-2 atmosphere at 1340 degrees C, followed by reoxidizing at 800 degrees-1100 degrees C in air. The PTCR characteristics of BT-BNT ceramics were investigated in terms of BNT content, reoxidation temperature, and time. Room-temperature resistivity ((RT)) of simples sintered in N-2 decreased to 102 center dot cm, and the jump in resistivity (maximum resistivity [(max)]/minimum resistivity [(min)]) was enhanced by three orders of magnitude through a suitable reoxidation process without sacrificing the (RT). The Curie temperature (T-c) was shifted to a high temperature (> 130 degrees C) with an increase in the BNT content. With the addition of 4 mol% BNT, the obtained ceramic exhibited a low (RT) of 2 x 102 center dot cm, a typical PTC effect of (max)/(min)> 103, and a T-c of 160 degrees C.