10.1007/s40097-015-0169-7

Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1−xFexO3 manganites prepared by sol–gel method

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  • D. Fatnassi*1,
  • Kheiria Sbissi2,
  • E. K. Hlil3,
  • M. Ellouze2,
  • J. L. Rehspringer4,
  • F. Elhalouani5,
  1. Faculty of Sciences of Sfax, Sfax University, Sfax, TN Institute of Physics and Chemistry of Materials of Strasbourg, UMR 7504 CNRS Université de Strasbourg, Strasbourg Cedex 2, 67034, FR
  2. Faculty of Sciences of Sfax, Sfax University, Sfax, TN
  3. Institute Néel, CNRS et Université Joseph Fourier, Grenoble Cedex 9, 38042, FR
  4. Institute of Physics and Chemistry of Materials of Strasbourg, UMR 7504 CNRS Université de Strasbourg, Strasbourg Cedex 2, 67034, FR
  5. National Engineering School of Sfax, Sfax, 3038, TN
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Published in Issue 24-07-2015

How to Cite

Fatnassi, D., Sbissi, K., Hlil, E. K., Ellouze, M., Rehspringer, J. L., & Elhalouani, F. (2015). Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1−xFexO3 manganites prepared by sol–gel method. Journal of Nanostructure in Chemistry, 5(4 (December 2015). https://doi.org/10.1007/s40097-015-0169-7
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Abstract

Abstract We present an investigation on magnetic and magnetocaloric properties of nano-sized La 0.8 Ca 0.2 Mn 1− x Fe x O 3 ( x  = 0, 0.01, 0.15, 0.2) manganites synthesized by sol–gel process. X-ray diffraction and magnetization measurements were performed to investigate both crystallographic structure and magnetocaloric properties, respectively. All samples show an orthorhombic structure with Pnma space group. Ferromagnetic–paramagnetic transition sensitive to iron doping is observed at Curie temperature ( T C ) ranging from 223 K ( x  = 0) to 70 K ( x  = 0.2). In addition, a large magnetocaloric effect near T C is observed. Under a magnetic field change of 5 T, a maximum of magnetic entropy ΔSMmax\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta S_{\text{M}}^{ \hbox{max} }$$\end{document} reaches 4.42, 4.32, 1.6, and 0.54 J kg −1  K −1 , for x  = 0, x  = 0.01, x  = 0.15, and x  = 0.2, respectively. The relative cooling power (RCP) values were computed as well. RCP values of 164 and 117 J kg −1 were found for La 0.8 Ca 0.2 MnO 3 (LCM) and La 0.8 Ca 0.2 Mn .0.99 Fe 0.01 O 3 (LCMFe 0.01 ), respectively. The large values of entropy changes and related RCP allow concluding that our material could be a highly attractive candidate for magnetic refrigeration.

Keywords

  • Pechini sol–gel,
  • Manganites,
  • Magnetocaloric effect,
  • Relative cooling power (RCP)
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