Above room temperature magnetic entropy in non-stoichiometric manganese of La0.67Sr0.33MnO3 manganites

With an aim to improve the magnetocaloric effect above the room temperature for practical applications, La 0.67 Sr 0.33 MnO 3 manganite with different manganese concentrations has been synthesized using a novel technique with oxalic acid as a fuel material. The X-ray photoelectron spectroscopy studi...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-08, Vol.128 (8), Article 727
Main Authors: Swetha, K., Bharadwaj, S., Kumar, N. Pavan, Chelvane, J. Arout, Lakshmi, Y. Kalyana
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Entropy
Ferromagnetism
Inhomogeneity
Machines
Magnetic properties
Magnetic transitions
Manganese
Manganites
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Oxalic acid
Phase transitions
Photoelectrons
Physics
Physics and Astronomy
Processes
Room temperature
Surfaces and Interfaces
Thin Films
Transition temperature
Valence
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Summary:With an aim to improve the magnetocaloric effect above the room temperature for practical applications, La 0.67 Sr 0.33 MnO 3 manganite with different manganese concentrations has been synthesized using a novel technique with oxalic acid as a fuel material. The X-ray photoelectron spectroscopy studies confirm the presence of mixed valence states of Mn 3+ and Mn 4+ with varying manganese content. Studies of the magnetic properties reveal that the samples undergo ferromagnetic to paramagnetic transitions well above room temperatures, i.e., around 383 K. The second order of magnetic phase transition has been confirmed from Arrott plots. The entropy change (ΔS M ) over a wide temperature range was observed around magnetic transition temperature in all the samples which can be considered as a suitable material for magnetic refrigeration applications. A reduction in magnetic entropy in deficiency and excess of manganese samples has been attributed to the magnetic inhomogeneity.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05879-1