LAUSR

Abstract The sol gel method was used for the synthesis of oxygen deficient oxide La1-xLixSrMn2O5+δ (with x = 0.05, 0.1 and 0.15). The structure, morphology, magnetic and magnetocaloric properties have been studied thoroughly by XRD, SEM, M/T and M/H. The structural study has demonstrated that all samples crystallize in Pm-3m space group. The magnetic properties have been investigated using temperature dependent magnetic susceptibility and magnetization as a function of applied magnetic field. Magnetic results have shown a large magnetocaloric effect near the Curie temperature TC which decreases with the increase of Li content (x). The maximum of the magnetic entropy change peaks has been observed around the TC temperature. Magnetic entropy changes |ΔSM| of 0.8, 0.97 and 1.1 J kg−1 K−1 obtained at 360, 348 and 345 K for x = 0.05, 0.1 and 0.15 respectively, under an applied magnetic field of 5T. The relative cooling power amounts 128.9 J Kg−1 and 120.3 J Kg−1 at 5 T for x = 0.1 and 0.15 respectively. These values are near to some others reported manganites. Thus, La1-xLixSrMn2O5+δ samples can be a promising candidate for magnetic refrigeration.