Magnetocaloric Effect of Ni56Mn18.8Ga24.5Gd0.7 Alloy

稀土学报(英文版), 2006, 24(5): 579-581.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.Institute of Scientific and Technical Information of China, Beijing 100038, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

3.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

4.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

5.State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

6.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

基金项目: 国家重点基础研究发展计划(973计划)(2006CB601101) 国家自然科学基金(50571008)

Magnetocaloric Effect of Ni56Mn18.8Ga24.5Gd0.7 Alloy

Keywords： NiMnGa

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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Magnetocaloric Effect of Ni56Mn18.8Ga24.5Gd0.7 Alloy

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