Frequency response of MgO:LiNbO3 crystals

MgO-doped congruent LiNbO₃ were grown by the Czochralski method. All MgO-doped LiNbO₃ crystals have a higher growing temperature than that of pure crystals. The frequency dependent dielectric spectra was measured to study the relaxational and conduction mechanism. Strong low frequency dispersion indicated that the main conduction mechanism of MgO-doped LiNbO₃ is by charge carrier hopping which may be caused by defects or Mg-ions. Impedance spectra measurement show that this system does not satisfy a Debye law but Jonscher´s “universal law”