Tuning Magnetic Entropy Change and Relative Cooling Power in La 0.7 Ca 0.23 Sr 0.07 MnO 3 Electrospun Nanofibers

We present experimental evidence about the magnetocaloric tuning effect in one-dimensional nanostructure fibers mixed-valence manganite as synthesized by electrospinning techniques and under heat treatments of 973, 1073 and 1173 K. The stoichiometry obtained is La Ca Sr MnO and Rietveld refinement i...

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Published inNanomaterials (Basel, Switzerland) Vol. 10; no. 3
Main Authors Burrola Gándara, Luis Andrés, Vázquez Zubiate, Lizeth, Carrillo Flores, Diana M, Elizalde Galindo, José T, Ornelas, Carlos, Ramos, Manuel
Format Journal Article
LanguageEnglish
Published Switzerland 29.02.2020
Subjects
manganite
electrospinning
magnetocaloric effect
nanofibers
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Summary:We present experimental evidence about the magnetocaloric tuning effect in one-dimensional nanostructure fibers mixed-valence manganite as synthesized by electrospinning techniques and under heat treatments of 973, 1073 and 1173 K. The stoichiometry obtained is La Ca Sr MnO and Rietveld refinement indicates a single-phase with an orthorhombic (Pnma) crystal structure. Scanning and transmission electron microscopy observations indicate coalescence in granular colonies of La Ca Sr MnO nanoparticles to conform nanofibers. Magnetic entropy change is tuned due to heat treatments at 1173 K with maximum values of 1, 1.82 and 2.51 J/kgK for applied external magnetic fields of = 1, 2 and 3T, respectively, with a maximum magnetic entropy difference at a Curie temperature of 293 K (furthermore, second-order magnetic phase transition was observed). Additionally, for a magnetic field, ~ = 3 T values of 49, 95 and 143 J/kg for 973, 1073 and 1173 K heat-treated samples were obtained.
ISSN:2079-4991
2079-4991