Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Large Magnetic Entropy Change in La0.55Ce0.2Ca0.25MnO3 Perovskite

  • Anwar, M.S. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Kumar, Shalendra (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Ahmed, Faheem (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Arshi, Nishat (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Kim, G.W. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Lee, C.G. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Koo, Bon-Heun (School of Nano and Advanced Materials Engineering, Changwon National University)
  • Received : 2011.10.14
  • Accepted : 2011.11.09
  • Published : 2011.12.31
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Abstract

In this paper, magnetic property and magnetocaloric effect (MCE) in perovskite manganites of the type $La_{(0.75-X)}Ce_XCa_{0.25}MnO_3$ (x = 0.0, 0.2, 0.3 and 0.5) synthesized by using the standard solid state reaction method have been reported. From the magnetic measurements as a function of temperature and applied magnetic field, we have observed that the Curie temperature ($T_C$) of the prepared samples strongly dependent on Ce content and was found to be 255, 213 and 150 K for x = 0.0, 0.2 and 0.3, respectively. A large magnetocaloric effect in vicinity of $T_C$ has been observed with a maximum magnetic entropy change (${\mid}{\Delta}S_M{\mid}_{max}$) of 3.31 and 6.40 J/kgK at 1.5 and 4 T, respectively, for $La_{0.55}Ce_{0.2}Ca_{0.25}MnO_3$. In addition, relative cooling power (RCP) of the sample under the magnetic field variation of 1.5 T reaches 59 J/kg. These results suggest that $La_{0.55}Ce_{0.2}Ca_{0.25}MnO_3$ compound could be a suitable candidate as working substance in magnetic refrigeration at 213 K.

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