| LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9)合金的磁热效应 |
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| 引用本文： | 伊博乐,松林,门德,刘璟芳,伊日勒图,特古斯.LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9)合金的磁热效应[J].稀有金属,2010,34(1). |
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| 作者姓名： | 伊博乐 松林 门德 刘璟芳 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： | 研究了LaGd0.1Fe11.4-xCoxSi1.6(x=0.1,0.3,0.5,0.7,0.9)系列合金的结构以及磁热效应。室温XRD分析表明该系列合金除微量的α-Fe相外,均具有立方NaZn13型立方单相晶体结构,空间群为Fm-3c。晶格常数没有明显变化,分别为1.1458,1.1454,1.1458,1.1459,1.469nm。磁性测量表明该系列合金的Tc随着Co含量的增加而增加,分别为212,231,253,281,302K。在外磁场变化ΔB=1.5T时,最大的磁熵变随着Co含量的增加而减少,由x=0.1的13.8J降为x=0.9J.kg-.1K-1的1.5J.kg-.1K-1。并且随着Co含量的增加存在由一级相变转为二级相变的趋势。
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| 关 键 词： | 合金 磁热效应 磁熵变 居里温度 |
Magnetocaloric Effect of LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9) Alloys |
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| Yi Bole,Song Lin,Men De,Liu Jingfang,Yiri Yoltu,Tegus O.Magnetocaloric Effect of LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9) Alloys[J].Chinese Journal of Rare Metals,2010,34(1). |
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| Authors: | Yi Bole Song Lin Men De Liu Jingfang Yiri Yoltu Tegus O |
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| Affiliation: | Yi Bole,Song Lin,Men De,Liu Jingfang,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 effect of substitution of Co for Fe on the structure,magnetic properties and magnetic entropy changes in LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9)was investigated.The X-ray diffraction showed that LaGd_(0.1) Fe_(11.4-x)Co_x Si_(1.6)(x=0.1,0.3,0.5,0.7,0.9)alloys consisted of the NaZn_(13)-type phase(Fm-3c)and minor amount of α-Fe phase.There were no obvious changes of cell constants,1.1458,1.14549,1.1458,1.1459,1.469 nm for x=0.1,0.3,0.5,0.7 and 0.9,respectively.Magnetic measurements showed that the Curie temperature of the alloys increased from 212 K to 302 K by changing the Co content from 0.1 to 0.9.the giant magnetic entropy change decreased from (13.8J·Kg_(-1)·K_(-1))to (1.5J·Kg_(-1)·K_(-1)) for x=0.1 and x=0.9under a magnetic field varying from 0 to 1.5 T.Additionally,there was a trend from first-order phase transition to second-order phase transition with increasing Co concentration. |
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| Keywords: | auoy magnetocaloric effect magnetic entropy change Curie temperature |
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