Abstract
The structural, microstructural, dielectric, impedance, modulus, leakage–current and magnetic characteristics of a double perovskite compound Dy2CoMnO6 have been reported in this communication. We have synthesized the compound by a high-temperature mixed-oxide route. From the analysis of X-ray diffraction data, the structure of the material is found to be monoclinic with lattice parameters: a = 5.5070 Å, b = 5.5683 Å, and c = 7.7217 Å, β = 90.830. The morphological study suggests that the compound has an almost homogeneous scattering and distribution of grains over the surface with small voids. The frequency dependence of dielectric parameter has been discussed according to the Maxwell-Wagner model and different polarization mechanisms. In the study of temperature dependence of dielectric permittivity, we observe a dielectric anomaly that corresponds to the ferroelectric to paraelectric phase transition. In the impedance analysis, we also observe both positive and negative temperature coefficient of resistance (PTCR and NTCR) behavior of the material. The nature of frequency dependence of conductivity has been explained by the Jonscher power law, and thus the conduction process of the material belongs to the overlapping large polaron tunneling model. The activation energy obtained from the relaxation and conduction processes is found to support the process of electron hoping. An analysis of leakage current density characteristics shows that the conduction mechanism in the material follows the space charge limited conduction (SCLC) process. Study of the magnetic hysteresis loop of the material shows the anti-ferromagnetic type of behavior.
Published Version
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