Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd 0.6 Sr 0.4 MnO 3 manganite.

Autor: Jeddi M; Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia marwajeddi@gmail.com., Massoudi J; Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia marwajeddi@gmail.com., Gharsallah H; Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia marwajeddi@gmail.com.; Institut Préparatoire aux Études d'Ingénieur de Sfax, Université de Sfax B. P. 1172 3018 Sfax Tunisia., Ahmed SI; Department of Physics, College of Science, Taif University P. O. Box 11099 Taif 21944 Saudi Arabia., Dhahri E; Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia marwajeddi@gmail.com., Hlil EK; Institut Néel, CNRS, Université J. Fourier B. P. 166 38042 Grenoble France.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2021 Feb 11; Vol. 11 (13), pp. 7238-7250. Date of Electronic Publication: 2021 Feb 11 (Print Publication: 2021).
DOI: 10.1039/d0ra10118d
Abstrakt: Nd 0.6 Sr 0.4 MnO 3 polycrystalline manganite was synthesized by two different methods: the auto-combustion reaction (NSMO-AC) and the sol-gel method (NSMO-SG). The structural, magnetic, magnetocaloric and critical behavior of the samples were examined. Rietveld refinements of the XRD patterns revealed that both compounds are pure single phase indexed to the orthorhombic system adopting the Pnma space group. The nanometric size estimated using the Williamson-Hall method was confirmed by TEM micrographs. Magnetic measurements as a function of temperature indicated that both samples underwent a second order ferromagnetic (FM)-paramagnetic (PM) phase transition at Curie temperature ( T C ). The relative cooling power was observed to be around 95.271 J kg -1 for NSMO-AC and 202.054 J kg -1 for NSMO-SG at μ 0 H = 5 T, indicating that these materials are potential candidates for magnetic refrigeration application close to room temperature. The critical behavior was estimated using diverse techniques based on the isothermal magnetization data recorded around the critical temperature T C . The calculated values are fully satisfactory to the requirements of the scaling theory, implying their reliability. The estimated critical exponents matched well with the values anticipated for the mean-field model and the 3D Ising model for NSMO-AC and NSMO-SG, respectively, showing that the magnetic interactions depended on the process of elaboration.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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