The overlap of first- and second-order phase transitions and related magnetic entropy changes in Ni2+xMn1-xGa Heusler alloys

被引：18
|
作者：
Khan, Mahmud [1 ]
Stadler, Shane [1 ]
Craig, Jonathan [1 ]
Mitchell, Joseph [1 ]
Ali, Naushad [1 ]
机构：
[1] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2006年 / 42卷 / 10期
关键词：
magnetic materials; magnetoelasticity;
D O I：
10.1109/TMAG.2006.879632
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A study of the magnetostructural phase transition and related magnetic entropy changes, Delta S-M, in the vicinity of a first-order magnetostructural transition, in polycrystalline shape memory alloys Ni2+xMn1-xGa (x = 0.16, 0.17, 0.18, 0.19, 0.20) have been done. Thermal expansion measurements reveal the gradual overlap of the first- and second-order phase transitions that results in the large magnetic entropy changes in the alloys. We observed a magnetic entropy change of Delta S-M = -66.2 J/kg(-1) K-.(-1) between 350 K and 350.5 K in a field change of 5 T in Ni2+xMn1-x Ga for x = 0.19.
引用
收藏
页码：3108 / 3110
页数：3
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