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• 作者：D. Fatnassi ; Kheiria Sbissi ; E. K. Hlil…
• 关键词：Pechini sol–gel ; Manganites ; Magnetocaloric effect ; Relative cooling power (RCP)
• 刊名：Journal of Nanostructure in Chemistry
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：5
• 期：4
• 页码：375-382
• 全文大小：2,349 KB
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• 作者单位：D. Fatnassi (1) (3)
  Kheiria Sbissi (1)
  E. K. Hlil (2)
  M. Ellouze (1)
  J. L. Rehspringer (3)
  F. Elhalouani (4)
  
  1. Faculty of Sciences of Sfax, Sfax University, BP 1171-3000, Sfax, Tunisia
  3. Institute of Physics and Chemistry of Materials of Strasbourg, UMR 7504 CNRS Université de Strasbourg, BP 43, 67034, Strasbourg Cedex 2, France
  2. Institute Néel, CNRS et Université Joseph Fourier, BP 166, 38042, Grenoble Cedex 9, France
  4. National Engineering School of Sfax, BP W, 3038, Sfax, Tunisia
  
• 刊物主题：Nanochemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：2193-8865

文摘

We present an investigation on magnetic and magnetocaloric properties of nano-sized La_0.8Ca_0.2Mn_{1?em class="EmphasisTypeItalic ">x} Fe _x O₃ (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 \(\Delta S_{\text{M}}^{ \hbox{max} }\) reaches 4.42, 4.32, 1.6, and 0.54 J kg? K?, 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? were found for La_0.8Ca_0.2MnO₃ (LCM) and La_0.8Ca_0.2Mn_.0.99Fe_0.01O₃ (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)