The Giant Magnetocaloric Effect of Gd5Si1.95Ge2.05 enhanced by Sn-doping
The effects of tin substitution on the phase formation, the Curie temperature and the magnetic entropy change of the monoclinic Gd5Si1.95Ge2.05 alloy have been investigated. Five Sn-doped Gd5Si1.95-xGe2.05-xSn2x samples were prepared with 2x = 0, 0.01, 0.03, 0.05 and 0.10, respectively. Experimental results show that a small amount of Sn-doping in Gd5Si1.95Ge2.05 retains the first order structural/magnetic transition, significantly enhances its magnetocaloric effects as well as increase its Curie temperature Tc, but leads to increase its hysteresis loss due to its field-induced monoclinic to orthorhombic phase transformation. The maximum magnetic entropy change of the Sn-doped Gd5Si1.935Ge2.035Sn0.03 sample for the 0-2.0 T magnetic field change reaches 28.9 J.kg-1.K-1 at 277 K, which is twice as large as that of pure Gd5Si1.95Ge2.05 (14.1 J.kg-1.K-1 at 260 K) for the same magnetic field change.
Gd5Si1.95Ge2.05 Sn doping magnetocaloric effect.
J. Q. Li Y. H. Zhuang W.D. Huang W. A. Sun Y. X. Jian
School of Materials, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials Key laboratory of Nonferrous Metal Materials and New Processing Technology, Guangxi University, Mini
国际会议
厦门
英文
458-463
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）