DIELECTRIC RESPONSE OF A SEMICONDUCTING CERAMIC BASED ON BARIUM TITANATE

Complex dielectric constant ε=ε'-iε" of a semiconducting BaTiO₃ ceramics has been measured at room temperature over the frequency range of 10kHz-500MHz. This dielectric response can be approximately described by the Debye type relaxtion equations, whereas the conductivity dominates the imaginary part at lower frequencies. From the dielectric measurement, the resistivity and the dielectric constant have been evaluated for the grains and grain boundaries separately.