Computational exploration of M-sites with chemical order and disorder in M′2M′′B2 and M′4M′′B3 compounds†

IF 5.8 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Nanoscale Pub Date : 2024-12-09 DOI:10.1039/D4NR02948H
Adam Carlsson, Rodrigo Mantovani Ronchi, Johanna Rosen and Martin Dahlqvist
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引用次数: 0

Abstract

Boron-based materials are highly desirable for their promising mechanical properties, rendering them ideal for various industrial applications. In this study, we take advantage of the two unique metal Wyckoff sites in the prototype structures V3B2 (4h and 2a) and Cr5B3 (16h and 4c). These two sites were populated by two different metals, M′ and M′′, forming novel B-based ternary M′2M′′B2 and M′4M′′B3 compounds. A high-throughput phase stability search encompassing a total of 2738 compositions with M′ and M′′ being occupied systematically with Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hf, Tl, and Pb was performed. The thermodynamic phase stability of the simulated materials was assessed by evaluating the formation enthalpy, ΔHcp for all compostions with chemical order and disorder for selective compositions. In total, 56 ternary phases were identified as stable when considering a configurational entropy contribution at 2000 K. Out of the 56 predicted stable phases, 32 displayed a preference for chemical order whereas 24 favored disorder of M′ and M′′. Initial attempts at synthesis of the predicted stable Ta2MoB2 compound were made, showing indications for the presence of ordered Ta2MoB2 or disordered (Ta0.667Mo0.333)3B2.

Abstract Image

M'2M " B2和M'4M " B3化合物中有序和无序M位的计算探索
硼基材料具有良好的机械性能,是各种工业应用的理想选择。在本研究中,我们利用了V3B2 (4h和2a)和Cr5B3 (16h和4c)原型结构中两个独特的金属位点的优势。当两种不同的金属M′和M′之间合金化时,进一步考虑了这两个位点,形成了新的b基三元化合物M′2M′B2和M′4M′B3。对共2738种成分进行了高通量的相稳定性搜索,其中M′和M′被Al、Si、Sc、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Ga、Ge、Y、Zr、Nb、Mo、Tc、Ru、Rh、Pd、Ag、Cd、In、Sn、Hf、Ta、W、Re、Os、Ir、Pt、Au、Hf、Tl和Pb系统地占据。通过计算生成焓∆Hcp来评价模拟材料的热力学相稳定性。此外,模拟无序金属进一步考虑与化合物确定为稳定或接近稳定的系统。考虑到2000 k时的构型熵贡献,总共有56个三元相被确定为稳定相,56个预测的稳定相中有32个表现出对化学顺序的偏好,而24个倾向于M‘和M’'的无序。对预测的稳定Ta2MoB2化合物进行了初步的合成尝试,表明存在有序Ta2MoB2或无序(Ta0.667Mo0.333)3B2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nanoscale
Nanoscale CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
12.10
自引率
3.00%
发文量
1628
审稿时长
1.6 months
期刊介绍: Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.
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