Electrical properties of rare earth doped BaTiO3 ceramics

The electrical resistivity (ρ) of Yb doped BaTiO
₃
ceramics in function of temperature is investigated in this article. The concentrations of additive in the BaTiO
₃
doped samples were ranged from 0.01 to 1.0 at % Yb. The conventional solid state reaction is used for preparation of initial samples. The samples are sintered at 1320° and 1380°C in air atmosphere for 4 hours. The electrical resistivity is measured in temperature range from 25°C to 170°C at versatile frequencies. To a temperature of 120°C, resistivity slightly increases with increasing of temperature, but above this temperature the resistivity increases rapidly. The electrical resistivity at the room temperature decreases with increasing concentration of Yb and gain the minimum at about 0.5 at% of donor concentration (low doping level). Over 0.5 at%, ρ increases rapidly with increment of donor content (high doping level). Also, the increment of frequency causes decrement of electrical resistivity for a few order of magnitude.