Cd-doping effects in Ni–Mn–Sn: experiment and ab-initio study
Cd-doping effects in Ni–Mn–Sn: experiment and ab-initio study
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DOI：
10.1088/1361-6463/ac5f33
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Z. Ghazinezhad;P. Kameli;A. Ghotbi Varzaneh;A. Sarsari;M. Norouzi-Inallu;T. Amiri;D. Salazar
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文献类型：
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作者：
Z. Ghazinezhad;P. Kameli;A. Ghotbi Varzaneh;A. Sarsari;M. Norouzi-Inallu;T. Amiri;D. Salazar
Heusler型Ni 47 Mn 40 Sn 13 −x Cd x（x= 0，0.75，1，1.25 at.）中的马氏体相变（MT）、磁性和磁热效应（MCE）。%）的变磁性形状记忆合金（MetaMSMA）的性能进行了研究，从实验和理论上，作为与Cd掺杂的函数。从头计算结果表明，铁磁（FM）配置是积极更有利的立方相比反铁磁（AFM）状态在未掺杂和掺杂的合金以及。此外，它表明，在基态的合金表现出四晶结构确认MT的存在，与实验一致。理论和实践都表明，Cd掺杂使晶胞体积减小，MT温度升高。利用在不同磁场下测得的热磁化曲线，间接估算了MT附近的MCE。结果表明，掺杂的合金表现出增强的值的逆MCE与那些Ni-Mn基的MetaMSMA。磁场变化为2 T时，最大磁熵变从未掺杂合金的3.0 J.kg-1 K-1增加到掺杂0.75和1 at.%的合金的3.4和5.0 J.kg-1 K-1分别为Cd。通过直接测量1.96T磁场变化下的绝热温度变化，对逆MCE和常规MCE进行了探索。Cd掺杂增加了近78%的最大逆MCE从0.9 K至1.6 K的未掺杂和掺杂合金，分别。结果表明，Cd掺杂可以有效地调整Ni-Mn-Sn MetaMSMA的结构、磁性和MCE性质。
Martensitic transformation (MT), magnetic properties, and magnetocaloric effect (MCE) in Heusler-type Ni47Mn40Sn13−x Cd x (x= 0, 0.75, 1, 1.25 at. %) metamagnetic shape memory alloys (MetaMSMAs) are investigated, both experimentally and theoretically, as a function of doping with Cd. Ab-initio computations reveal that the ferromagnetic (FM) configuration is energetically more favorable in the cubic phase than the antiferromagnetic (AFM) state in undoped and doped alloys as well. Moreover, it is revealed that the alloys in the ground state exhibit a tetragonal structure confirming the existence of MT, in agreement with the experiments. It was indicated, both in theory and practice, that a reduction of the unit cell volume and an increase of the MT temperature as a function of the Cd doping. Indirect estimations of MCE in the vicinity of MT were carried out by using thermomagnetization curves measured under different magnetic fields up to 5 T. The results demonstrated that the doped alloys exhibit enhanced values of the inverse MCE comparable with those of Ni-Mn-based MetaMSMAs. Maximum magnetic entropy change in a field change of 2 T increases from 3.0 J.kg−1K−1 for the undoped alloy to 3.4 and 5.0 J.kg−1K−1 for the alloys doped with 0.75 and 1 at.% of Cd, respectively. The inverse and conventional MCE were explored by direct measurements of the adiabatic temperature change under the magnetic field change of 1.96 T. The Cd doping increased the maximum of inverse MCE by nearly 78% from 0.9 K to 1.6 K for the undoped and doped alloys, respectively. The results depicted that Cd doping can effectively tailor the structural, magnetic, and MCE properties of the Ni–Mn–Sn MetaMSMAs.