Reversibility in the adiabatic temperature-change of Pr0.73Pb0.27MnO3

Highlights: ► The magnetocaloric properties of a manganite Pr0.73Pb0.27MnO3 have been studied. ► The Curie temperature has been found as 234 K. ► We have measured directly the adiabatic temperature change. ► The maximum magnetic entropy-change was determined as 4.7 J kg−1 K−1 in 3 T. ► The maximum adiabatic temperature-change was determined as 2.5 K in 3 T. -- Abstract: The investigation of structure, magnetic and magnetocaloric properties of Pr0.73Pb0.27MnO3 perovskite has been studied by using the X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and magnetization. The X-ray diffraction pattern shows reflections typical of the perovskite structure with cubic symmetry. The field cooled (FC), zero-field-cooled (ZFC) and field-heated (FH) thermomagnetic measurements at 50 Oe indicate a sharp change of magnetization at the phase-transition (TC ≈ 234 K). The magnetic entropy changes were determined from M(H) isotherms that were measured at various temperatures around TC. The magnetic entropy changes in magnetic field changes of 1 T and 2 T were 2.4 J kg−1 K−1 and 3.8 J kg−1 K−1, respectively. The adiabatic temperature change of this material, ΔTad, was measured by means of an adiabatic calorimeter directly. The results indicate a maximum adiabatic temperature change produced by a magnetic field change of 3 T is 2.5 K at 236 K