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La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05)合金的磁热效应 被引量:2

Magnetocaloric Effect of La_(1.1)Fe_(11.4)Si_(1.55)Ge_(0.05) Alloy
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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(T<Tc)转变为顺磁性(T>Tc)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。 The La1.1Fe11.4Si1.55Ge0.05 alloy was prepared by arc melting. The effect of Magnetocaloric Effect was investigated in La1.1Fe11.4Si1.55Ge0.05 alloy by substituting small amount of Ge. The La1.1Fe11.4GexSi1.6-x alloy was prepared by annealing in an evacuated quartz tube for 10 d at 1273 K. XRD analysis showed that the alloy could be stabilized with Ge substitution in the NaZn13-type structure and minor amount of α-Fe phase. The curves of M-T and Arrott indicated that the metamagnetic transformation was a se...
出处 《稀有金属》 EI CAS CSCD 北大核心 2010年第1期133-136,共4页 Chinese Journal of Rare Metals
基金 国家自然科学基金资助项目(50661004) 内蒙古自治区自然科学基金重大项目(20080404ZD09) 内蒙古师范大学研究生创新基金项目(CXJJS08022)
关键词 磁热效应 礠熵变 居里温度Tc magnetocaloric effect magnetic entropy change Curie temperature
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