Magnetic and Crystallographic Properties of Shape Memory Alloys Ni2Mn1+xSn1-x
Magnetic and Crystallographic Properties of Shape Memory Alloys Ni2Mn1+xSn1-x
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DOI：
10.4028/www.scientific.net/msf.583.119
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
T. Kanomata;K. Fukushima;H. Nishihara;R. Kainuma;W. Itoh;K. Oikawa;K. Ishida;K. Neumann;K. Ziebeck
中科院分区：
文献类型：
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作者：
T. Kanomata;K. Fukushima;H. Nishihara;R. Kainuma;W. Itoh;K. Oikawa;K. Ishida;K. Neumann;K. Ziebeck
对磁性形状记忆合金Ni2Mn1+xSn1-x进行了X射线粉末衍射和磁化强度测量。含0≤x≾0.4的合金为立方L21结构，表现出铁磁行为。X射线衍射图表明，过剩的Mn原子占据了Sn位。此外，磁化强度测量表明，取代锡位的锰原子以反铁磁方式耦合到铁磁性锰亚晶格上。含0.4≾x≤0.6的合金经历了从高温L2 1结构到正交4O结构的马氏体相变。这些合金表现出各种磁性转变。根据交换作用的原子间依赖关系，定性地讨论了Ni2Mn1+xSn1-x体系的磁相图。
X-ray powder diffraction and magnetization measurements were done on the magnetic shape memory alloys Ni2Mn1+xSn1-x. The alloys with 0≤x≾0.4 crystallize in the cubic L21 structure and exhibit the ferromagnetic behavior. X-ray diffraction patterns indicate that the excess Mn atoms occupy the Sn sites. Furthermore, magnetization measurements make clear that the Mn atoms, which substitute for Sn sites, are coupled antiferromagnetically to the ferromagnetic manganese sublattices. The alloys with 0.4≾x≤0.6 undergo a martensitic transition from the high temperature L21 structure to the orthorhombic 4O one. These alloys show a variety of magnetic transitions. A magnetic phase diagram of Ni2Mn1+xSn1-x system is discussed qualitatively on the basis of the interatomic dependence of the exchange interactions.