Structural and magnetic properties of MnCo1-xFexSi alloys
Structural and magnetic properties of MnCo1-xFexSi alloys
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MnCo1-xFexSi 合金的结构和磁性
DOI：
10.1016/j.jmmm.2015.04.005
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发表时间：
2015
影响因子：
2.7
通讯作者：
G. H. Wu
中科院分区：
文献类型：
--
作者：
J. H. Chen;Z. Y. Wei;E. K. Liu;X. Qi;W. H. Wang;G. H. Wu
采用差示扫描量热法（DSC）、X射线粉末衍射（XRD）和磁性测量等方法研究了MnCo 1− xFexSi（0≤ x≤ 0.50）合金的晶体结构、马氏体相变和磁性。在高温顺磁状态下，合金发生了由Ni 2 In型六方母相向TiNiSi型正交马氏体的马氏体结构转变。随Fe含量的增加，马氏体转变温度（TM）和马氏体居里温度（TCM）均降低。引入的Fe原子在Fe-6 Mn原子构型内建立铁磁（FM）耦合，并破坏MnCoSi化合物中的双螺旋反铁磁（AFM）耦合，导致马氏体相从螺旋AFM状态到FM状态的磁性变化。对于x= 0.10，0.15和0.20的合金，在两种磁性状态之间观察到了变磁转变。提出了MnCo 1− xFexSi（0≤ x≤ 0.50）合金的磁结构相图。
The crystal structures, martensitic structural transitions and magnetic properties of MnCo 1− x Fe x Si (0≤ x≤ 0.50) alloys were studied by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and magnetic measurements. In high-temperature paramagnetic state, the alloys undergo a martensitic structural transitions from the Ni 2 In-type hexagonal parent phase to the TiNiSi-type orthorhombic martensite. Both the martensitic transition temperature (T M) and Curie temperatures of martensite (T C M) decrease with increasing Fe content. The introduced Fe atoms establish ferromagnetic (FM) coupling within Fe-6Mn atom configurations and destroy the double spiral antiferromagnetic (AFM) coupling in MnCoSi compound, resulting in a magnetic change in the martensite phase from a spiral AFM state to an FM state. For the alloys with x= 0.10, 0.15 and 0.20, a metamagnetic transition was observed in between the two magnetic states. A magnetostructural phase diagram of MnCo 1− x Fe x Si (0≤ x≤ 0.50) alloys was proposed.