| Magnetocaloric Effect of Ni56Mn18.8Ga24.5 Gd0.7 Alloy |
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| 作者姓名： | Zhang Zeyu ~ Long Yi ~ Duan Jingfang ~ Huang Peng ~ Wu Guangheng ~ Chang Yongqin ~ |
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| 作者单位： | 1. Institute of Scientific and Technical Information of China，Beijing 100038，China; 2. School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China; 3. State Key Laboratory for Magnetism，Institute of Physics，Chinese Academy of Sciences，Beijing 100080，China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | Inrecent years materials with high magnetocaloriceffect (MCE) have attracted considerable attention ow-ingto its potential application as a magnetic refriger-ant .Many material systemsthat underwentthefirst-or-der magnetic transition have been found to exhibit agiant MCE. Their typical representatives areGd5(SixGe1 -x)41 ,2]and La (FexSi1 -x)133 ,4]alloys .Ni MnGa is aferromagnetic shaped memory alloy whichundergoes a reversible first-order structural phase tran-sition (SPT) with the …
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| 关 键 词： | NiMnGa 磁热效应 磁转变 结构转换 磁熵 稀土元素 |
| 文章编号： | 1002-0721（2006）05-0579-03 |
| 收稿时间： | 2006-02-13 |
| 修稿时间： | 2006-04-26 |
Magnetocaloric Effect of Ni56Mn18.8Ga24.5Gd0.7 Alloy |
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| Zhang Zeyu ,,Long Yi ,Duan Jingfang ,Huang Peng ,Wu Guangheng ,Chang Yongqin .Magnetocaloric Effect of Ni56Mn18.8Ga24.5 Gd0.7 Alloy[J].Journal of Rare Earths,2006,24(5):579-581. |
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| Authors: | Zeyu Yi Long Jingfang Duan Peng Huang Guangheng Wu Yongqin Chang |
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| Affiliation: | aInstitute of Scientific and Technical Information of China, Beijing 100038, China;bSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;cState Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | With the addition of Gd, the Ni56Mn18.8Ga24.5Gd0.7 alloy exhibits non-modulated martensite phase at room temperature. From the illustration of Gd microstructure, it can be found that Gd exists along the subgrain boundaries. Hence,he crystalline size decreases and the mechanical properties improve. Ac-susceptibility results show that Ni56Mn18.8Ga24.5Gd0.7 alloy still undergoes simultaneous structural and magnetic transitions and transforms from ferromagnetic martensitic phase to paramagnetic austenitic phase with increasing temperature. The maximum magnetic entropy change is 13.4 J· (kg· K) - 1 under 1.9 T field at 338 K. The giant magnetocaloric effect found in Ni56Mn18.8Ga24.5Gd0.7 alloy is attributed to the concurrently occurring first-order structural- and magnetic-phase transitions. |
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| Keywords: | NiMnGa magnetocaloric effect (MCE) magnetic transition structural transition magnetic entropy rare earths |
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