Origin of hardness in WB4 and its implications for ReB4, TaB4, MoB4, TcB4, and OsB4

Origin of hardness in WB4 and its implications for ReB4, TaB4, MoB4, TcB4, and OsB4
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WB4 中硬度的起源及其对 ReB4、TaB4、MoB4、TcB4 和 OsB4 的影响

DOI:
10.1063/1.2977760
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发表时间:
2008-09
影响因子:
4
通讯作者:
Zou, Guangtian
Zou, Guangtian
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Yinwei;Wang, Mei;Cui, Tian;Ma, Yanming;Zou, Guangtian

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对超硬材料WB4(维氏硬度超过46 Gpa)进行了第一性原理计算,揭示了其高硬度的原因。我们模拟的晶格参数、体弹性模量和硬度与实验数据符合得很好。发现了沿z轴具有独特的B2二聚体和XY平面蜂窝B亚晶格的三维B网络是导致高硬度的主要原因。我们进一步预测了WB4结构中的其他五种过渡金属B化合物(TMB4,Tm=Re,Mo,Ta,Os和Tc)是潜在的超硬材料。
First-principles calculations were performed on the superhard material, WB4 (Vicker hardness exceeding 46GPa), to reveal the origin of its high hardness. Our simulated lattice parameters, bulk modulus, and hardness are in excellent agreement with the experimental data. A three-dimensional B network with a peculiar B2 dimer along the z-axis and a xy planar honeycomb B sublattice is uncovered to be mainly responsible for the high hardness. We further predicted that five other transition metal B compounds (TMB4, TM=Re, Mo, Ta, Os, and Tc) within the WB4 structure are potential superhard materials.
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