Investigation of Dielectric Studies of (Nd1-xGdx)2FeCrO6 (X = 0.0 – 0.3) Double Perovskite

In this article, we have done a comprehensive study of the (Nd1-xGdx)2FeCrO6 (x = 0.0 – 0.3) (NGFCO) series. Our study comprises an in-depth analysis of structural properties, dielectric behavior, impedance characteristics, and conductivity analysis of the NGFCO series. Solid-state reaction technique was employed to prepare the samples. Single-phase configuration is confirmed, by analyzing the XRD patterns of all the samples with Rietveld refinement. All of them exhibit the orthorhombic structure with the Pbnm space group. In the frequency-dependent impedance studies, the contribution of space charge polarization is discussed, and the temperature-dependent study reveals the negative temperature coefficient behavior of resistance in the samples. The presence of relaxation behavior that is not of the ideal Debye type is revealed from the Nyquist plots of all the samples. Using the Jonscher power law, the frequency-dependent conductivity data are analyzed, leading to the conclusion that both the small and large polaron tunnelling models effectively describe the conduction mechanism in our samples.