Ultra-incompressible Orthorhombic Phase of Osmium Tetraboride (OsB4) Predicted from First Principles

Ultra-incompressible Orthorhombic Phase of Osmium Tetraboride (OsB4) Predicted from First Principles
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根据第一原理预测的四硼化锇 (OsB4) 的超不可压缩正交相

DOI:
10.1021/jp2106378
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发表时间:
2012-02
影响因子:
3.7
通讯作者:
Wang, Hui
Wang, Hui
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Meiguang;Yan, Haiyan;Zhang, Gangtai;Wang, Hui

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利用从头算粒子群优化算法进行晶体结构预测,我们预测了OsB4的正交Pmmn结构,该结构在能量上远优于先前提出的wb4型结构。Pmmn结构由边缘连接的不规则OsB10十二面体组成,在环境压力下可以稳定地解压成o和B的混合物。正交相中的OsB4由于具有高体积模量(294 GPa)和高硬度(28 GPa),是一种超不可压缩的硬质材料,这是由于其强而定向的共价B-B和B-Os键。
Using the ab initio particle swarm optimization algorithm for crystal structure prediction, we have predicted an orthorhombic Pmmn structure for OsB4, which is energetically much superior to the previously proposed WB4-type structure. The Pmmn structure consists of irregular OsB10 dodecahedrons connected by edges and is stable against decompression into a mixture of Os and B at ambient pressure. OsB4 within this orthorhombic phase is found to be an ultra-incompressible and hard material due to its high bulk modulus (294 GPa) and large hardness (28 GPa), originating from the strong and directional covalent B–B and B–Os bonds.
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