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Type: Artigo
Title: Magnetocaloric Functional Properties Of Sm0.6sr0.4mno3 Manganite Due To Advanced Nanostructured Morphology
Author: Andrade
V. M.; Pedro
S. S.; Caraballo Vivas
R. J.; Rocco
D. L.; Reis
M. S.; Campos
A. P. C.; Coelho
A. A.; Escote
M.; Zenatti
A.; Rossi
A. L.
Abstract: The magnetocaloric effect (MCE) is the key concept to produce new, advanced, freon-like free, low cost and environmental friendly magnetic refrigerators. Among several potential materials, Sm0.6Sr0.4MnO3 manganite presents one of the highest MCE value in comparison to all other known manganites; however, its studied was only concentrated on the bulk material. To overcame this lack of the information nanoparticles and nanotubes of that highlighted manganite were successfully produced by using a sol gel modified method. High resolution transmission electron microscopy revealed nanoparticle and nanotube diameters of 45 nm and 200 nm, respectively; and, in addition, this technique also showed that the wall of the nanotube is formed by the nanoparticles with 25 nm of diameter. The magnetocaloric potentials, Delta S-M versus T curves, of the nanostructures were obtained and they are broader than the their bulk counterpart. This increases the useful temperature range of a magnetic refrigerator. But also an undesired M-shape profile for the nanotube sample was observed, due to the rising of a super paramagnetic behavior. These results also evidenced the existence of a nanoparticle size threshold below which the advantage to make the transition wider is no longer valid. (C) 2015 Elsevier B.V. All rights reserved.
Subject: Sol-gel Growth
Magnetic Properties
Editor: Elsevier Science SA
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2015.12.013
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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