Synthesis, Magnetic and Magnetocaloric Properties of Transition Element Doped La0.67Ba0.33MnO3

Colossal magnetoresistance materials have demonstrated large changes in resistance in the presence of magnetic fields. In the current work, a group of such materials, with the compositional formula La0.67Ba0.33MnO3 and 10% Fe, Co, Ni, Zn doped La0.67Ba0.33MnO3 have been prepared by conventional solid-state method. Structural analysis has been carried out by X-Ray diffraction method followed by Rietveld analysis. Magnetic transition between ferromagnetism to paramagnetism has been observed from the magnetic characterizations. Parameters such as Curie temperature (θP) and effective magnetic moment (µeff) are obtained from susceptibility analysis subject to Curie–Weiss law. Furthermore, magnetocaloric nature of the samples is examined from the M-H isotherms. Using Maxwell’s relations, isothermal entropy change, ∆Smax are determined to check whether the prepared samples can be used for magnetic refrigeration around the room temperature.