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http://dx.doi.org/10.3740/MRSK.2018.28.8.445

Magnetic Properties and Magnetocaloric Effect in Ordered Double Perovskites Sr1.8Pr0.2FeMo1-xWxO6  

Hussain, Imad (School of Materials Science and Engineering, Changwon National University)
Anwar, Mohammad Shafique (School of Materials Science and Engineering, Changwon National University)
Khan, Saima Naz (Department of Physics, Abdul Wali Khan University Mardan)
Lee, Chan Gyu (School of Materials Science and Engineering, Changwon National University)
Koo, Bon Heun (School of Materials Science and Engineering, Changwon National University)
Publication Information
Korean Journal of Materials Research / v.28, no.8, 2018 , pp. 445-451 More about this Journal
Abstract
We report the structural, magnetic and magnetocaloric properties of $Sr_{1.8}Pr_{0.2}FeMo_{1-x}W_xO_6$($0.0{\leq}x{\leq}0.4$) samples prepared by the conventional solid state reaction method. The X-ray diffraction analysis confirms the formation of the tetragonal double perovskite structure with a I4/mmm space group in all the synthesized samples. The temperature dependent magnetization measurements reveal that all the samples go through a ferromagnetic to paramagnetic phase transition with an increasing temperature. The Arrott plot obtained for each synthesized sample demonstrates the second order nature of the magnetic phase transition. A magnetic entropy change is obtained from the magnetic isotherms. The values of maximum magnetic entropy change and relative cooling power at an applied field of 2.5 T are found to be $0.40Jkg^{-1}K^{-1}$ and $69Jkg^{-1}$ respectively for the $Sr_{1.8}Pr_{0.2}FeMoO_6$ sample. The tunability of magnetization and excellent magnetocaloric features at low applied magnetic field make these materials attractive for use in magnetic refrigeration technology.
Keywords
double perovskites; magnetization; magnetocaloric effect; magnetic entropy change;
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