Abstract
The magnetocaloric effect in an array of nanocomposites manganite Nd1-xSrxMnO3 (x = 0.0, 0.2, 0.4, 0.6 and 0.8) was reported in this study. The nanocomposites were synthesized using auto-combustion sol-gel technique where replacing Nd3+ by Sr2+ influence the structure and hence enhancing the magnetic properties and magnetocaloric effect. The synthesized nanocomposites form an orthorhombic crystal structure with Pnma space group No.62 and the average crystallite size was found to be ∼30 nm. The tunning (Mn4+/Mn3+) ratio varies in the nanocomposites with different concentration where the Nd0.6Sr0.4MnO3 nanocomposite exhibits maximum (Mn4+/Mn3+) ratio. The ZFC-FC magnetization measurements indicate that all samples exhibit ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature and other phase transitions are observed for all samples except Nd0.6Sr0.4MnO3 which also shows a peak Curie temperature (TC = 256 K) in the vicinity of room temperature. The presence of FM in NdMnO3 sample is highly enhanced via FM double exchange (DE) interaction due to self-doping process. Room temperature hysteresis loop reveals paramagnetic (PM) behaviour whereas the pronounced effect presents in Nd0.6Sr0.4MnO3 compound compared to other compounds. However, all compounds exhibit FM behaviour at low temperature measurements with saturation magnetization (Ms) raising up gradually and reaching its maximum at x = 0.4. The magnetic entropy change | ΔSM | is calculated through isotherms measurements and Nd0.6Sr0.4MnO3 nanocomposite exhibits a relatively giant value of magnetic entropy (12.71 J/kg.K and 7.78 J/kg.K at around 257.5 K) under a maximum applied magnetic field of 9 T and 5 T respectively. The corresponding relative cooling power (RCP) for this compound is found accordingly as 636.9 J/kg and 349.8 J/kg. The obtained results in the wide range of temperature starting from very low temperature up to room temperature recommend Nd0.6Sr0.4MnO3 compound as a good potential material for magnetic cooling.
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