Crystal structures, stability, electronic and elastic properties of 4d and 5d transition metal monoborides: First-principles calculations

Crystal structures, stability, electronic and elastic properties of 4d and 5d transition metal monoborides: First-principles calculations
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4d 和 5d 过渡金属一硼化物的晶体结构、稳定性、电子和弹性性质:第一性原理计算

DOI:
10.1016/j.jallcom.2012.05.114
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发表时间:
2012-10
影响因子:
6.2
通讯作者:
Jiang, J. Z.
Jiang, J. Z.
中科院分区:
材料科学2区
文献类型:
--
作者:
Wang, Y.;Chen, W.;Chen, X.;Liu, H. Y.;Ding, Z. H.;Ma, Y. M.;Wang, X. D.;Cao, Q. P.;Jiang, J. Z.

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通过第一原理计算研究了4d和5d过渡金属一硼化物的晶体结构、稳定性、电子和弹性性质。研究发现,NaCl型ZrB、NbB、MoB、HfB、TaB和WB,WC型TcB、RuB、ReB、OsB和IrB以及抗NiAs型RhB和PdB在零压下是热力学稳定的。它们都是金属的。与一碳化物和一氮化物相比,这些一硼化物的维氏硬度相对较低。阐明了B空位的存在是WC型IrB和反NiAs型PtB的理论和实验结果之间晶格参数差异的根源,而化学计量的IrB和PtB的计算结果表明分别是机械不稳定和动态不稳定。
The crystal structures, stability, electronic and elastic properties of 4d and 5d transition metal monoborides have been studied by first principles calculations. It is found that NaCl-type ZrB, NbB, MoB, HfB, TaB and WB, WC-type TcB, RuB, ReB, OsB and IrB, and anti-NiAs-type RhB and PdB are thermodynamically stable at zero pressure. They all are metallic. The Vickers hardnesses of these monoborides are relatively low as compared with monocarbides and mononitrides. It is clarified that the presence of B-vacancies is the origin for the difference of lattice parameters between theoretical and experimental results for WC-type IrB and anti-NiAs-type PtB while IrB and PtB with stoichiometry from calculations are revealed to be mechanically unstable and dynamically unstable, respectively.
通过第一原理研究 5d 过渡金属单氮化物的电子和机械性能
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