We found for the first time that (1 - x) Na0.5Bi0.5TiO3-xBiZn(0.5)Ti(0.5)O(3) (NBT-BZT) composite ceramics showed negative temperature coefficient (NTC) at a high temperature. The NBT-BZT nanopowders were successfully prepared by Pechini method. Their ceramics were sintered at 1100 degrees C. The NBT-BZT ceramic exhibited a good linear relationship between logarithm of electrical resistivity (In rho) and reciprocal of absolute temperature (1000/T) at 250 degrees C-1050 degrees C. The obtained rho(600), rho(900), and B-600/900 constants of the NBT-ZBT NTC thermistors are approximately 5.92 x 10(6) to 3.01 x 10(4) omega cm, 7.03 x 10(3) to 7.60 x 10(2) omega cm and 2.3 x 10(4)-1.3 x 10(4) K, respectively. The electrical characteristics can be tuned to the desired value by changing the Na0.5Bi0.5TiO3 content in the compound. The electrical conductivity in these compounds is due to the electron jumps between Ti3+ and Ti4+ and oxygen-ion conductivity. Results demonstrate a tremendous potential of the studied system for perovskite materials with NTC performance.