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.