Evolution of magnetic and transport properties in (Cr1−xMnx)2AlC MAX-phase synthesized by arc melting technique
Evolution of magnetic and transport properties in (Cr1−xMnx)2AlC MAX-phase synthesized by arc melting technique
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DOI：
10.1016/j.jmmm.2019.165642
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发表时间：
2020
影响因子：
2.7
通讯作者：
K. Sobolev;K. Kolincio;A. Emelyanov;A. Mielewczyk‐Gryń;M. Gazda;M. Roman;A. Pazniak;V. Rodionova
中科院分区：
文献类型：
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作者：
K. Sobolev;K. Kolincio;A. Emelyanov;A. Mielewczyk‐Gryń;M. Gazda;M. Roman;A. Pazniak;V. Rodionova
在这里，我们开始回归电弧熔炼技术，以产生MAX相固溶体。合成了（Cr1−xMnx）2AlC MAX相（X = 0，0.025，0.05和0.1）块体样品，并利用X射线衍射、扫描电镜和X射线能谱对其进行了研究。结果表明，随着掺杂浓度的增加，样品中的Cr7C3、AlCr2+和Al2O3第二相的含量略有增加，样品的相组成均匀。由于熔化过程中高能等离子体的作用，锰成功地混合在MAX相结构中。SQUID磁强计确定了铁和反铁磁相互作用的共存，后者在高温下盛行，并归因于MAX相。在大约4 K和5 K的掺杂样品，这是与铁磁性Mn基第二相的边际量的存在下观察到的磁状态转变。在高掺杂样品中，在低温下观察到磁阻的负分量，这可能是由于铁磁第二相的影响。传输特性测量显示，所生产的样品的质量令人满意。
Herein we initiate a comeback to the arc melting technique to produce MAX-phase solid solutions. Bulk samples of (Cr1−xMnx)2AlC MAX-phase withX= 0, 0.025, 0.05 and 0.1 were synthesized and studied by means of X-ray diffractometry, scanning electron microscopy in combination with energy-dispersive X-ray spectroscopy. Samples were established to be homogeneous with an incorporation of Cr7C3, AlCr2and Al2O3secondary phases which is slightly increasing with the raise of the dopant concentration. Manganese successfully intermixes in the MAX-phase structure due to the effect of the high-energetic plasma during the melting process. SQUID magnetometry identified the co-existence of ferro- and antiferromagnetic interactions with the latter prevailing in high temperatures and being attributed to the MAX-phase. Magnetic state transitions were observed at approximately 4 K and 5 K for doped samples which was associated with the presence of the marginal amount of ferromagnetic Mn-based secondary phases. The negative component of magnetoresistance was observed in highly doped samples at low temperatures that is likely due to the influence of ferromagnetic secondary phases as well. Transport properties measurement revealed the satisfactory quality of the produced samples.