Magnetocaloric effect at room temperature in powder of La0.5(CaSr)0.5MnO3

The series of strontium-substituted calcium La0.5Ca0.5−xSrxMnO3 has been studied and show the effect of strontium substitution. Magnetic studies on La0.5Ca0.5−xSrxMnO3 compounds are reported. The substitution of a bigger cation, Sr2+ for Ca2+ enhances the Curie temperature (TC) from 228 K (x = 0) to 335 K (x = 0.5) and we have found a value of TC around room temperature (273 K) for x = 0.15. Maximum magnetic-entropy change (ΔSM) and relative cooling power (RCP) are discussed for La0.5Ca0.35Sr0.15MnO3 compound. The magnetic-entropy change is ∼0.615 J/(kg K) at TC (273 K) for a magnetic field of 2 T and the RCP is 36.5 J/kg, which suggests La0.5Ca0.35Sr0.15MnO3 compound a possible candidate for magnetic refrigerants near room temperature.