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采用第一性原理方法研究了RuB2六方结构和四方结构的晶体结构、弹性模量和电子结构。通过理论计算发现这两种结构的晶格参数和晶胞体积与实验值比较吻合,说明计算结果合理可信。计算的弹性模量显示这两种RuB2结构表现出优异的力学性能,通过电子结构的计算发现在Ru与B原子之间主要是以Ru的4d和B2p电子轨道上的电子杂化并形成了Ru-B共价键。在基态下RuB2主要以四方结构稳定存在。
The first-principle method was used to study the crystal structure, elastic modulus and electronic structure of RuB2 hexagonal structure and tetragonal structure. The theoretical calculation shows that the lattice parameters and unit cell volume of these two structures are in good agreement with the experimental ones, which shows that the calculation results are reasonable and credible. The calculated elastic modulus shows that the two RuB2 structures exhibit excellent mechanical properties. The calculation of the electronic structure shows that between Ru and B atoms, the electronic hybridization mainly occurs on the 4d and B2p electrons of Ru and the formation of Ru B covalent bond. In the ground state, RuB2 mainly exists in a stable tetragonal structure.