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arXiv 2009.14543cond-mat.mtrl-sci
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用于能源应用的磁性MAB相的设计

Designing of Magnetic MAB Phases for Energy Applications

Chen Shen, Qiang Gao, Nuno M. Fortunato, Harish K. Singh, Ingo Opahle, Oliver Gutfleisch, Hongbin Zhang

摘要:

基于高通量的密度泛函理论计算,我们进行了筛选稳定的磁性MAB化合物和预测潜在的强磁体的永磁体和磁热应用。系统地评估了热力学、机械和动力学稳定性,得出凸包上有21种未报道的化合物,考虑到凸包公差为100 meV/原子,有434种材料处于亚稳态。基于Hume-Rothery规则的分析表明,价电子浓度和尺寸因子差异在确定稳定性方面具有重要意义,与局部原子成键具有良好的对应关系。我们发现了71个化合物的磁晶各向异性能的绝对值大于1.0 MJ/m $^3$和23个化合物的单轴各向异性大于0.4 MJ/m $^3$,这是潜在的间隙磁铁。基于磁形变代理,99个化合物被确定为具有感兴趣的磁热性能的潜在材料。

英文摘要:

Based on high-throughput density functional theory calculations, we performed screening for stable magnetic MAB compounds and predicted potential strong magnets for permanent magnet and magnetocaloric applications. The thermodynamical, mechanical, and dynamical stabilities are systematically evaluated, resulting in 21 unreported compounds on the convex hull, and 434 materials being metastable considering convex hull tolerance to be 100 meV/atom. Analysis based on the Hume-Rothery rules revealed that the valence electron concentration and size factor difference are of significant importance in determining the stability, with good correspondence with the local atomic bonding. We found 71 compounds with the absolute value of magneto-crystalline anisotropy energy above 1.0 MJ/m$^3$ and 23 compounds with a uniaxial anisotropy greater than 0.4 MJ/m$^3$, which are potential gap magnets. Based on the magnetic deformation proxy, 99 compounds were identified as potential materials with interesting magnetocaloric performance.

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