The Effects of La Doping on the Crystal Structure and Magnetic Properties of Ni(2)In-Type MnCoGe(1-x)La(x) (x = 0, 0.01, 0.03) Alloys.

The Effects of La Doping on the Crystal Structure and Magnetic Properties of Ni(2)In-Type MnCoGe(1-x)La(x) (x = 0, 0.01, 0.03) Alloys.
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DOI:
10.3390/ma14143998
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发表时间:
2021-07-16
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Chen F
Chen F
中科院分区:
其他
文献类型:
--
作者:
Bi Y;He W;Yang T;Wu W;Wen J;Yu X;Chen F

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在本实验中,使用真空电弧熔炼方法制备了一系列MnCoGe 1 −xLax(x = 0,0.01,0.03)合金样品。采用X射线衍射(XRD)、Rietveld法、物理性能测试系统(PPMS)和振动样品磁强计(VSM)等分析手段研究了合金的晶体结构和磁性能。结果表明,经1373 K退火后,所有样品均为Ni 2 In型高温相,空间群为P63/mmc(194)。Rietveld精修的结果表明,MnCoGe 1 −xLax的晶格常数和体积随着La常数的增大而沿着增大.磁性测量结果表明,MnCoGe 1 −xLax系列合金的居里温度(TC)分别为294、281和278 K。在1.5T下的最大磁熵变分别为1.64、1.53和1.56 J·kg-1·K-1。制冷量(RC)分别为60.68、59.28和57.72 J·kg−1,在系列中略有沿着下降。实验结果表明,La的掺杂使样品的TC降低,磁熵基本不变,RC略有降低。
In this experiment, a series of MnCoGe1−xLax (x = 0, 0.01, 0.03) alloy samples were prepared using a vacuum arc melting method. The crystal structure and magnetic properties of alloys were investigated using X-ray diffraction (XRD), Rietveld method, physical property measurement system (PPMS), and vibrating sample magnetometer (VSM) analyses. The results show that all samples were of high-temperature Ni2In-type phases, belonging to space group P63/mmc (194) after 1373 K annealing. The results of Rietveld refinement revealed that the lattice constant and the volume of MnCoGe1−xLax increased along with the values of La constants. The magnetic measurement results show that the Curie temperatures (TC) of the MnCoGe1−xLax series alloys were 294, 281, and 278 K, respectively. The maximum magnetic entropy changes at 1.5T were 1.64, 1.53, and 1.56 J·kg−1·K−1, respectively. The respective refrigeration capacities (RC) were 60.68, 59.28, and 57.72J·kg−1, with a slight decrease along the series. The experimental results show that the doping of La results in decreased TC, basically unchanged magnetic entropy, and slightly decreased RC.
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