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arXiv 2008.08781cond-mat.mtrl-sciphysics.data-an
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硼笼对Nd-Fe-B晶体结构稳定性的影响

Boron cage effects on Nd-Fe-B crystal structure's stability

Duong-Nguyen Nguyen, Duc-Anh Dao, Takashi Miyake, Hieu-Chi Dam

摘要:

在这项研究中,我们研究了假设的Nd-Fe-B晶体结构的结构稳定性关系,使用相关分析和t-SNE降维方法。采用元素替代法从Open Quantum Materials Database中的5967个LA-T-X主体结构中生成了149个假想的Nd-Fe-B晶体结构,其中LA表示镧系元素,T表示过渡金属,X表示轻元素B、C、N和O。通过用Nd取代所有镧系元素位点,用Fe取代所有过渡金属位点,用B取代所有轻元素位点来创建假设的晶体结构。高通量的第一性原理计算被应用于评估这些结构的相稳定性。其中20个被发现是潜在的可成形的。对轨道场矩阵(OFM)材料描述子的相关性分析表明,平均原子配位数是决定这些取代Nd-Fe-B晶体结构稳定性的关键因素。在20个被发现潜在可形成的假设结构中,有19个具有大于6.5的平均配位数。此外,OFM描述符表示的所有本地结构被集成到一个可见的空间,研究它们的特性和它们所属的晶体结构的稳定性之间的详细相关性。我们发现,不稳定的取代结构经常进行Nd和Fe的本地结构与两个突出点:低的平均配位数和完全占据B相邻原子。此外,只有三种流行的形式的B局部结构出现在所有潜在的可形成的替代结构:笼状网络,平面网络,和间隙网站。发现的关系是有希望的,以加快筛选过程中的新的可成形的晶体结构。

英文摘要:

In this study, we investigate the structure-stability relationship of hypothetical Nd-Fe-B crystal structures using descriptor-relevance analysis and the t-SNE dimensionality reduction method. 149 hypothetical Nd-Fe-B crystal structures are generated from 5967 LA-T-X host structures in Open Quantum Materials Database by using the elemental substitution method, with LA denoting lanthanides, T denoting transition metals, and X denoting light elements such as B, C, N and O. A hypothetical crystal structure is created by substituting all lanthanide sites with Nd, all transition metal sites with Fe, and all light element sites with B. High-throughput first-principle calculations are applied to evaluate the phase stability of these structures. Twenty of them are found to be potentially formable. The descriptor-relevance analysis on the orbital field matrix (OFM) materials' descriptor reveals the average atomic coordination number as the essential factor in determining the structure stability of these substituted Nd-Fe-B crystal structures. 19 among 20 hypothetical structures that are found potentially formable have an average coordination number larger than 6.5. In addition, all the local structures represented by the OFM descriptors are integrated into a visible space to study the detailed correlation between their characteristics and the stability of the crystal structure to which they belong. We discover that unstable substituted structures frequently carry Nd and Fe local structures with two prominent points: low average coordination numbers and fully occupied B neighboring atoms. Moreover, there are only three popular forms of B local structures appearing on all potentially formable substituted structures: cage networks, planar networks, and interstitial sites. The discovered relationships are promising to speed up the screening process for the new formable crystal structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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