Tuning Magnetic Entropy Change and Relative Cooling Power in La0.7Ca0.23Sr0.07MnO3 Electrospun Nanofibers
Resumen
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 La0.7Ca0.23Sr0.07MnO3
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 La0.7Ca0.23Sr0.07MnO3 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 µ0H = 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, ~µ0H = 3 T values of 49, 95 and 143 J/kg for 973, 1073 and 1173 K
heat-treated samples were obtained.