Giant magnetocaloric effect and magnetic properties of nanocomposites of manganite Nd1-xSrxMnO3 (0.0 ≤ x ≤ 0.8) synthesized using modified sol-gel method

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 magneti...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-03, Vol.857, p.1, Article 157566
Main Authors: Al-Yahmadi, I.Z., Gismelssed, A., Abdel-Latif, I.A., Al Ma’Mari, F., Al-Rawas, A., Al-Harthi, S., Al-Omari, I.A., Yousf, A., Widatallah, H., ElZain, M., Myint, M.T.Z.
Format: Article
Language:English
Subjects:
Crystal structure
Crystallites
Curie temperature
Entropy
Ferromagnetism
Hysteresis loops
Low temperature
Magnetic cooling
Magnetic properties
Magnetic saturation
Magnetism
Magnetization
Magnetocaloric effect
Manganite
Manganites
Nanocomposites
Phase transitions
RCP
Room temperature
Sol-gel processes
Synthesis
XPS
XRD
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Summary: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. [Display omitted] •The interaction between DE and SE by following the development of Mn4+/Mn3+ ratio in Nd1-xSrxMnO3 (0.0, 0.2, 0.4, 0.6 and 0.8) nanocomposites has been presented.•The magnetocaloric MC parameters over the wide range of temperature showed the giant magnetocaloric effect with high relative cooling power in Nd0.6Sr0.4MnO3 compound.•The magnetic properties as well as magnetocaloric (MC) effect and the relative cooling power (RCP) results of Nd0.8Sr
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157566