Analysis of conductivity and PTCR effect in Er-doped BaTiO3 ceramics

Barium titanate ceramics with different Er additions in the range from 0.25 to 8 at.% were prepared by a solid state route. Several values of the nominal Ba/Ti ratio were considered according to different potential incorporation mechanisms of the dopant. PTCR effect was detected also for high Er content and for different nominal incorporation mechanisms. Impedance Spectroscopy and I-V measurements in the temperature range from 20 to 200 °C were used to verify the Double Depletion Layer model over the whole temperature range. First results of Differential Analysis of Impedance data are presented.