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A first-principles investigation of a new hard multi-layered MnB2 structure

机译:一种新的多层硬质MnB 2 结构的第一性原理研究

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ReB2-type MnB2 has always been considered to be the ground-state structure of MnB2. However, subsequent theoretical study has revealed that this structure is easy to decompose into elemental Mn and B under ambient conditions, which motivated us to look for a stable MnB2 structure at high pressures. Using structure prediction algorithm USPEX and density functional theory calculations, we found a stable multi-layered MnB2 structure with space group Immm at high pressure. The calculated hardness of Immm-MnB2 is 22.5 GPa, which makes it a potential hard multifunctional material along with its conductive and magnetic properties. The hexagonal graphene-like boron networks of Immm-MnB2 contribute to its hardness and stability.
机译:ReB 2 型MnB 2 一直被认为是MnB 的基态结构 2 。然而,随后的理论研究表明,该结构在环境条件下易于分解为元素Mn和B,这促使我们寻找在高温下稳定的MnB 2 结构压力。利用结构预测算法USPEX和密度泛函理论计算,发现了一种稳定的多层MnB 2 多层结构,其空间群为 Immm Immmm -MnB 2 的计算硬度为22.5 GPa,这使其具有潜在的硬质多功能材料的导电性和磁性。 Immm -MnB 2 的六方石墨烯状硼网络有助于其硬度和稳定性。

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