Dielectric Spectroscopy Studies in Zn2FeNO3, Zn2AlNO3 and Zn2Fe0.5Al0.5NO3

Dielectric response, impedance, modulus, dc and ac conductivity of hydroxide double lamellar (LDH), [Zn2AlNO3], [Zn2FeNO3] and [Zn2Fe0.5Al0.5NO3] at room temperature and at frequency range (1Hz-1MHz). LDH prepared by the co-precipitation technique, the results of X-ray diffraction confirmed the partial and overall substitution of Al by Fe. The space group does not change neither the structure also. The dielectric analysis reveals the presence of electrode polarization, free charge motion at low frequencies which are related to space charge polarization and Conductivity relaxation respectively. Complex impedance plots (Cole-Cole plots) showed a non-Debye type relaxation. These are resolved into tow semicircles, indicating the bulk, grain boundary. Modulus studies confirm the conductivity effect by hopping and localized motion of ions. The frequency dependence of the electric conductivity was found to follow a double power law behavior, in accordance with the relation ?’(?) = ?dc+A1?s1 +A2?s2, where S1 and S2are smaller than1.