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Influence of Ni/Mn ratio on magnetostructural transformation and magnetocaloric effect in Ni48-xCo2Mn38+xSn12 (x = 0, 1.0, 1.5, 2.0, and 2.5) ferromagnetic shape memory alloys |
Ishfaq Ahmad Shah1, Najam ul Hassan1, Abdur Rauf2, Jun Liu(刘俊)1, Yuanyuan Gong(龚元元)1, Guizhou Xu(徐桂舟)1, Feng Xu(徐锋)1 |
1 Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2 Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract An investigation on the magnetostructural transformation and magnetocaloric properties of Ni48-xCo2Mn38+xSn12 (x=0, 1.0, 1.5, 2.0, and 2.5) ferromagnetic shape memory alloys is carried out. With the partial replacement of Ni by Mn in the Ni48Co2Mn38Sn12 alloy, the electron concentration decreases. As a result, the martensitic transformation temperature is decreased into the temperature window between the Curie-temperatures of austenite and martensite. Thus, the samples with x=1.5 and 2.0 exhibit the magnetostructural transformation between the weak-magnetization martensite and ferromagnetic austenite at room temperature. The structural transformation can be induced not only by the temperature, but also by the magnetic field. Accompanied by the magnetic-field-induced magnetostructural transformation, a considerable magnetocaloric effect is observed. With the increase of x, the maximum entropy change decreases, but the effective magnetic cooling capacity increases.
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Received: 27 April 2017
Revised: 23 May 2017
Accepted manuscript online:
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PACS:
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51601092, 51571121, and 11604148), the Fundamental Research Funds for the Central Universities, China (Grant Nos. 30916011344 and 30916011345), Jiangsu Natural Science Foundation for Distinguished Young Scholars, China (Grant No. BK20140035), China Postdoctoral Science Foundation (Grant No. 2016M591851), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20160833 and BK20160829), Qing Lan Project of Jiangsu Province, China, Priority Academic Program Development of Jiangsu Higher Education Institutions, China, and NMG-NJUST Joint Scholarship Program for Ishfaq Ahmad Shah (Student ID: 914116020118). |
Corresponding Authors:
Feng Xu
E-mail: xufeng@njust.edu.cn
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Cite this article:
Ishfaq Ahmad Shah, Najam ul Hassan, Abdur Rauf, Jun Liu(刘俊), Yuanyuan Gong(龚元元), Guizhou Xu(徐桂舟), Feng Xu(徐锋) Influence of Ni/Mn ratio on magnetostructural transformation and magnetocaloric effect in Ni48-xCo2Mn38+xSn12 (x = 0, 1.0, 1.5, 2.0, and 2.5) ferromagnetic shape memory alloys 2017 Chin. Phys. B 26 097501
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