Effect of trivalent rare earth doping on magnetic and magnetocaloric properties of La_0.47(Y,Eu)_0.2Pb_0.33MnO₃ manganites

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• 作者：A. Ben Hassine^a ; A. Dhahri^a ; ^{abdessalem_dhahri@yahoo.fr" class="auth_mail" title="E-mail the corresponding author} ; M.-L. Bouazizi^b ; M. Oumezzine^a ; E.K. Hlil^c
• 关键词：Manganite ; Magneto-caloric effect ; Magnetic entropy
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1390-1393
• 全文大小：726 K

文摘

The La_0.47Ln_0.2Pb_0.33MnO₃ (Ln=Eu and Y) polycrystalline has been synthesized using the solid state reaction method at high temperature. The X-ray diffraction shows that the materials crystallized in the orthorhombic structure. Magnetization measurements versus temperature in a magnetic applied field of 0.05 T show that all our samples exhibit a paramagnetic–ferromagnetic transition with decreasing temperature. The value of the Curie temperatures are 275 K and 264 K for Ln=Eu and Y, respectively. The magnetic entropy change reaches a peak 4e">$(-\Delta S_m^{\max })$ also decreases from 3.31 J/kg. K for Ln=Eu to 2.97 J/kg. K for Ln=Y, and the corresponding values of relative cooling power (RCP) reach 243.25 and 178.88 J/kg, under a magnetic field of 5 T. The results suggest that those polycrystalline could be useful for magnetic refrigeration in a broad temperature range.