Sinee Coey et al. prepared the R<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> compounds by means of doping the nitrogenin gas-phase reaction, the magnetic properties of R<sub>2<...Sinee Coey et al. prepared the R<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> compounds by means of doping the nitrogenin gas-phase reaction, the magnetic properties of R<sub>2</sub>Fe<sub>17</sub> intermetallic compounds havebeen significantly improved. This aroused wide interest of relevant scientists. Recent re-search results show that Sm<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> has excellent intrinsic magnetic properties, but the nitridesR<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> consisting of other rare-earth elements except Sm, have an easy-plane anisotropy.In addition, Sm is very expensive. This kind of permanent magnetic materials is展开更多
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 Th2Zn1...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-△SM for 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 △SM and RC values,chemical stability, and a high performance-to-cost ratio make Pr2Fe17-xMnxalloys be selectable materials for room temperature magnetic refrigeration applications.展开更多
文摘Sinee Coey et al. prepared the R<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> compounds by means of doping the nitrogenin gas-phase reaction, the magnetic properties of R<sub>2</sub>Fe<sub>17</sub> intermetallic compounds havebeen significantly improved. This aroused wide interest of relevant scientists. Recent re-search results show that Sm<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> has excellent intrinsic magnetic properties, but the nitridesR<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> consisting of other rare-earth elements except Sm, have an easy-plane anisotropy.In addition, Sm is very expensive. This kind of permanent magnetic materials is
基金financially supported by the U.S. Department of Energy by Iowa State University (No. DE-AC0207CH11358)the Guangdong Provincial Science & Technology Program (No. 2010B050300008)+2 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No. x2clB7120290)the Guangzhou Municipal Science and Technology Program (No. 12F582080022)the Fundamental Research Funds for the Central Universities (Nos. 2012ZZ0013 and 2011ZM0014)
文摘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-△SM for 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 △SM and RC values,chemical stability, and a high performance-to-cost ratio make Pr2Fe17-xMnxalloys be selectable materials for room temperature magnetic refrigeration applications.
