Influence of bismuth on magnetism and magnetocaloric properties of LaFe11.6Si1.4 intermetallic compound
来源期刊：Journal of Rare Earths2015年第7期
论文作者：A.Boutahar H.Lassri E.K.Hlil
文章页码：740 - 745
摘 要：Crystal structure, magnetic properties and magnetocaloric effects（MCE） of La1–xBixFe11.4Si1.6（x=0.0 and 0.1） compounds were investigated by X-ray diffraction and magnetization measurements. The La1–xBixFe11.4Si1.6 compounds presented a cubic Na Zn13 type structure. First, the magnetization behavior and the magnetic transition were analyzed in terms of Landau theory. Then, Bi substitution for La in La1–xBixFe11.4Si1.6 compounds led to a decrease in magnetic entropy change（-ΔSmaxM） but an increase in Curie temperature（TC） significantly. The significant increase of TC by Bi substitution from 202.5 to 256 K for x=0.0 and x=0.1 respectively was attributed to an increase in the Fe-Fe exchange interactions. Moreover, magnetocaloric effect was calculated in terms of isothermal magnetic entropy change. The maximum values of（-ΔSmaxM） of La1–xBixFe11.4Si1.6 for x=0.0 and 0.1 compounds were found to be, respectively, 22.56 and 4.36 J/（kg·K） under an applied magnetic field change of 5 T. For the same applied magnetic field（μ0H=5 T）, the relative cooling power（RCP） values were found to vary between 487 and 296 J/kg.
A.Boutahar1,2，H.Lassri1，E.K.Hlil3
1. LPMMAT,Hassan II University-Casablanca, Faculty of Science Ain Chock, BP 5366, Maarif-Casablanca, Morocco3. Néel Institue, CNRS and Joseph Fourier University
摘 要：Crystal structure, magnetic properties and magnetocaloric effects（MCE） of La1–xBixFe11.4Si1.6（x=0.0 and 0.1） compounds were investigated by X-ray diffraction and magnetization measurements. The La1–xBixFe11.4Si1.6 compounds presented a cubic Na Zn13 type structure. First, the magnetization behavior and the magnetic transition were analyzed in terms of Landau theory. Then, Bi substitution for La in La1–xBixFe11.4Si1.6 compounds led to a decrease in magnetic entropy change（-ΔSmaxM） but an increase in Curie temperature（TC） significantly. The significant increase of TC by Bi substitution from 202.5 to 256 K for x=0.0 and x=0.1 respectively was attributed to an increase in the Fe-Fe exchange interactions. Moreover, magnetocaloric effect was calculated in terms of isothermal magnetic entropy change. The maximum values of（-ΔSmaxM） of La1–xBixFe11.4Si1.6 for x=0.0 and 0.1 compounds were found to be, respectively, 22.56 and 4.36 J/（kg·K） under an applied magnetic field change of 5 T. For the same applied magnetic field（μ0H=5 T）, the relative cooling power（RCP） values were found to vary between 487 and 296 J/kg.
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