Magneto-caloric properties of La0.8-xSmxSr0.2MnO3 (x=0.0, 0.05, 0.1, and 0.15)

In this work, the manganite's magnetocaloric properties are studied by changing their chemical composition for a group La_0.8-xSm_xSr_0.2MnO₃ (x = 0.0, 0.05, 0.10, and 0.15) ceramic synthesized by the solid-state reaction method. According to the X-ray powder diffraction (XRD) analysis, no sign of a secondary phase is detected. It is found that the prepared samples are formed in the rhombohedral crystal structure with an R-3c space group. There is a decreasing trend in the unit cell volume, which indicates the gradual replacement of Sm in La sites. The results obtained from the energy-dispersive X-ray (EDAX) spectroscopy test indicated that the ratio of elements in the compounds is close to their nominal values. Based on the M measurements (upon the change of temperature) of the as-prepared specimens, an FM transition is observed. The transition temperature decreases upon the increase of the x value. The measured magnetic entropies of all the La_0.8-xSm_xSr_0.2MnO₃ samples are an illustration of a magnetocaloric impact on these compounds. This observation introduces La_0.8-xSm_xSr_0.2MnO₃ as a potential candidate for applications related to magnetic refrigeration.