| La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05)合金的磁热效应 |
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| 引用本文： | 刘璟芳,松林,门德,伊博乐,伊日勒图,特古斯.La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05)合金的磁热效应[J].稀有金属,2010,34(1). |
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| 作者姓名： | 刘璟芳 松林 门德 伊博乐 伊日勒图 特古斯 |
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| 作者单位： | 内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室,内蒙古,呼和浩特,010022 |
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| 基金项目： | 国家自然科学基金资助项目，内蒙古自治区自然科学基金重大项目，内蒙古师范大学研究生创新基金项目 |
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| 摘 要： | 使用电弧熔炼法制备了La1.1Fe11.4Si1.55Ge0.05合金。研究了用少量的Ge替代Si后,La1.1Fe11.4Si1.55Ge0.05合金的磁性和磁热效应。粉末X射线衍射结果表明:在1273K真空退火处理10d后,合金La1.1Fe11.4Si1.55Ge0.05主相为NaZn13型立方结构,存在微量的α-Fe相。热磁曲线M-T与Arrott曲线表明:在居里温度Tc=205K处发生由铁磁性(TTc)转变为顺磁性(TTc)的二级磁相变。在磁场变化0～1.5T下,根据等温磁化曲线通过Maxwell关系式计算得出最大磁熵变-ΔSmmax=9J.kg-.1K-1。Ge替代Si后该合金在其居里温度Tc处-ΔSm-T曲线半高宽增大,使合金的相对制冷能力RCP(S)有所提高。
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| 关 键 词： | 磁热效应 磁熵变 居里温度T_c |
Magnetocaloric Effect of La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05) Alloy |
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| Liu Jinfang,Song Lin,Men De,Yi Bole,Yiri Yoltu,TeGus.Magnetocaloric Effect of La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05) Alloy[J].Chinese Journal of Rare Metals,2010,34(1). |
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| Authors: | Liu Jinfang Song Lin Men De Yi Bole Yiri Yoltu TeGus |
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| Affiliation: | Liu Jingfang,Song Lin,Men De,Yi Bole,Yiri Yoltu,Tegus O (Inner Mongolian Key Laboratory for Physics , Chemistry of Functional Materials,Inner Mongolia Normal University,Huhhot 010022,China) |
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| Abstract: | The La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05) alloy was prepared by arc melting.The effect of MagnetocMoric Effect was investigated in La_(1.1) Fe_(11.4)Si_(1.55)Ge_(0.05) alloy by substituting small amount of Ge.The La_(1.1)Fe_(11.4)GexSi_(1.6-x) alloy was prepared by annealing in all evacuated quartz tube for 10 d at 1273 K.XRD analysis showed that the alloy could be stabilized with Ge substitution in the NaZn_(13)-type structure and minor amount of α-Fe phase.The curves of M-T and Arrott indicated that the metamagnetic transformation was a second-phase between ferromagnetism and paramagnetism.On the magnetic field change of 0-1.5 T.Maxwell relation was employed to calculate the maximum magnetic entropy change of -△S_m~(max)=9 J·kg~(-1)·K~(-1).The Curie temperature of La_(1.1) Fe_(11.4) Si_(1.55) Ge_(0.05) alloy was increased. Both the full width at half maximum of isothermal magnetic entropy change-△S_m~(max),and the relative cooling power RCP(s)of La_(1.1)Fe_(11.4) Si_(1.55)Ge_(0.05) alloy increased. |
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| Keywords: | magnetocaloric effect magnetic entropy change Curie temperature |
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