Dielectric relaxation in SrFe1∕2Nb1∕2O3

TLDR: In this article, the authors measured the dielectric permittivity and the loss tangent of the strontium iron niobate SrFe1∕2Nb1 ∕2O3 ceramic with an activation energy of 0.272eV.

Abstract: The strontium iron niobate SrFe1∕2Nb1∕2O3 ceramic is synthesized by a solid-state reaction technique. The x-ray diffraction of the sample at room temperature shows a monoclinic phase. The dielectric permittivity and the loss tangent of the sample are measured in a frequency range from 50Hzto2MHz and in a temperature range from 143to473K. The frequency dependence of the loss peak is found to obey an Arrhenius law with an activation energy of 0.272eV. An analysis of the loss factor with frequency is performed by using the scaling behavior of the dielectric loss spectra. The scaling behavior of the dielectric loss spectra shows its temperature-independent nature. The relaxation mechanism is discussed in the framework of conductivity and impedance spectroscopy. The variation of dielectric constant with temperature is explained considering the space-charge polarization.