Journal of the American Ceramic Society, Vol.84, No.11, 2707-2709, 2001
Positive temperature coefficient of resistance effect in heavily niobium-doped barium titanate by the growth of the double-twinned seeds
Positive temperature coefficient of resistivity (PTCR) was attained in heavily niobium-doped BaTiO3 through the addition of BaTiO3 seed particles. The seed particles containing a double twin grew during heat treatment, and a uniform microstructure composed of large, coarse grains was obtained. The incorporation of niobium. into the grain via grain growth probably caused the semiconducting and PTCR character of the niobium-doped BaTiO3.