Magnetic phase transitions and magnetocaloric properties of (Gd12-xTbx)Co-7 alloys

作者：Zheng Z G; Zhong X C; Yu H Y; Liu Z W^*; Zeng D C

来源：Journal of Applied Physics, 2011, 109(7): 07A919.

DOI：10.1063/1.3551736

• Magnetic entropy change
• Magnetic phase transitions
• Magnetocaloric properties
• Monoclinic structures
• Refrigerant capacity
• Reversible magnetization
• Spin reorientation transitions
• Temperature range

The structure and magnetocaloric properties of polycrystalline (Gd12-xTbx)Co-7 (x = 0, 4, and 8) alloys with Ho12Co7-type monoclinic structure have been investigated. A spin reorientation transition occurs at about 123 K for the alloy with x = 0. The peak values of magnetic entropy change Delta S-M under a magnetic field change Delta H of 5 T is 8.8 J.kg(-1).K-1 at 160.8 K (T-c), 8.2 J.kg(-1).K-1 at 140.8 K (T-c), and 7.1 J.kg(-1).K-1 at 118.9 K (T-c) for the alloys with x = 0, 4 and 8, respectively. The refrigerant capacities reach 478, 327, and 160 J.kg(-1) for x = 0, 4, and 8, respectively. The relatively large magnetic entropy change and reversible magnetization behavior make these alloys a good choice for magnetic refrigeration applications in the temperature range of 118-160 K.

• 出版日期2011-4-1
• 单位华南理工大学