Structural,magnetic, magnetocaloric and impedance spectroscopy analysis of Pr0.8Sr0.2MnO3 manganite prepared by modified solid-state route

Orthorhombic Pr_0.8Sr_0.2MnO₃ sample is prepared by solid-state reaction method and quenched in water. The occurrence of a second-order phase transition is confirmed by Arrott plots. The critical exponents determined using different models are in good agreement with the 3D-Ising model. The magnetocaloric results have shown an important maximum of the magnetic entropy change and relative cooling power evaluated at 2.14 J?kg^?1?K^?1 and 101.52 J?kg^?1 under a field change of 2T. The DC conductance measurements revealed that this compound exhibited a semiconductor to metallic behavior at $T_{\mathit{SM}}=400$ K. Moreover, the AC results are described by the Jonscher power law. Concerning the electrical and dielectric properties, they disclosed the behavior-dependency of both temperature and frequency. As for the complex impedance measurements, they showed that the conduction mechanism was governed by grain boundaries. The dielectric results demonstrated important values of the real part of the permittivity, and the Pr_0.8Sr_0.2MnO₃ material can be used for capacitor manufacturing.