Magnetocaloric effect of Pr2Fe17-xMnx alloys
来源期刊：Rare Metals2014年第5期
论文作者：Xi-Chun Zhong Zhong-Wu Liu De-Chang Zeng Karl A.Gschneidner Jr. Vitalij K.Pecharsky
文章页码：552 - 555
摘 要：Polycrystalline Pr2Fe17-xMnx（x = 0, 1, and 2）alloys were studied by X-ray diffraction（XRD）, heat capacity, ac susceptibility, and isothermal magnetization measurements. All the alloys adopt the rhombohedral Th2Zn17-type structure. The Curie temperature increases from 283 K at x = 0 to 294 K at x = 1, and then decreases to 285 K at x = 2. The magnetic phase transition at the Curie temperature is a typical second-order paramagnetic–ferromagnetic transition. For an applied field change from0 to 5 T, the maximum-DSMfor Pr2Fe17-xMnxalloys with x = 0, 1, and 2 are 5.66, 5.07, and 4.31 J kg-1 K-1,respectively. The refrigerant capacity（RC） values range from 458 to 364 J kg-1, which is about 70 %–89 % that of Gd. The large, near room temperature DSMand RC values,chemical stability, and a high performance-to-cost ratio make Pr2Fe17-xMnxalloys be selectable materials for room temperature magnetic refrigeration applications.
Xi-Chun Zhong1,2，Zhong-Wu Liu1，De-Chang Zeng1，Karl A.Gschneidner Jr.2，Vitalij K.Pecharsky2
1. School of Materials Science and Engineering, South China University of Technology2. Ames Laboratory, U.S.Department of Energy, and Department of Materials Science and Engineering, Iowa State University
摘 要：Polycrystalline Pr2Fe17-xMnx（x = 0, 1, and 2）alloys were studied by X-ray diffraction（XRD）, heat capacity, ac susceptibility, and isothermal magnetization measurements. All the alloys adopt the rhombohedral Th2Zn17-type structure. The Curie temperature increases from 283 K at x = 0 to 294 K at x = 1, and then decreases to 285 K at x = 2. The magnetic phase transition at the Curie temperature is a typical second-order paramagnetic–ferromagnetic transition. For an applied field change from0 to 5 T, the maximum-DSMfor Pr2Fe17-xMnxalloys with x = 0, 1, and 2 are 5.66, 5.07, and 4.31 J kg-1 K-1,respectively. The refrigerant capacity（RC） values range from 458 to 364 J kg-1, which is about 70 %–89 % that of Gd. The large, near room temperature DSMand RC values,chemical stability, and a high performance-to-cost ratio make Pr2Fe17-xMnxalloys be selectable materials for room temperature magnetic refrigeration applications.
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