Abstract
Magnetic, morphological, and physical properties of Pr0.63La0.37-xSrxMnO3 (x(Sr) = 0.00, 0.05, 0.10, 0.15, 0.20, and 0.30) magnetic nanoparticles have been studied experimentally based on the evolution of the amount of Sr in these systems and by heat treatment. A solid-state reaction method was used to prepare the samples. The microstructure of the samples was determined by scanning electron microscopy. Three sets of Sr-doped manganites of the perovskite family Pr0.63La0.37-xSrxMnO3 nanoparticles were heated at three different temperatures, i.e., 500, 700, and 800 degrees C. X-ray data showed that all compounds in the cubic space group Fd-3m crystallized. Field-cooled and zero-field-cooled thermomagnetic curves measured at low field and low temperatures showed that systems have different magnetic states, varying from superparamagnetic, ferromagnetic to paramagnetic states, with charge ordering behavior present in some prepared systems. The maximum entropy change of the x(Sr-800 degrees C) = 0.05 sample reached the highest value of refrigerant capacity compared to other systems in a magnetic field with 17.278 J/kg at 1 T and 208.264 J/kg at 7 T.