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arXiv 2102.00446cond-mat.mtrl-sci
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富硼化合物B6X(X = S,Se)的高硬度和光电热物理性质的来源--基于DFT方法的综合研究

Origin of high hardness and optoelectronic and thermo-physical properties of boron-rich compounds B6X (X = S, Se): a comprehensive study via DFT approach

M. M. Hossain, M. A. Ali, M. M. Uddin, A. K. M. A. Islam, S. H. Naqib

摘要:

在本研究中,结构和迄今未调查的机械(弹性刚度常数,机械加工性指数,柯西压力,各向异性指数,脆性/延展性,泊松比),电子,光学和热力学性质的新型富硼化合物B6 X(X = S,Se)已探索使用密度泛函理论。估计的结构晶格参数与之前的报道一致。这些化合物的机械和动力学稳定性已在理论上建立。这些材料本质上是脆性的并且是弹性各向异性的。B6 S和B6 Se的断裂韧性值KIC为~ 2.07 MPam 0.5,评价了限制材料内部裂纹扩展的阻力。B6 S和B6 Se化合物都具有在31-35 GPa范围内的高硬度值,并且具有成为硬化合物类别的突出成员的潜力。偏态密度(PDOS)证实了强共价键和费米能级以下低能处的尖峰导致了高硬度。能带结构和态密度的变化表明了化合物的间接半导体性质。德拜温度(ΘD)、最小热导率(Kmin)、晶格热导率(kph)、低热膨胀系数和低密度的相对高的值表明两种富硼硫属化物都可以用作热管理材料。在中紫外区(3.2-15 eV)的研究材料和低反射率(~ 16%)的大的吸收能力显着。这些有利的特征使研究中的化合物有望用于UV表面消毒装置以及医疗灭菌设备应用。这些化合物的所有研究的物理性质之间的良好的相关性。

英文摘要:

In the present study, the structural and hitherto uninvestigated mechanical (elastic stiffness constants, machinability index, Cauchy pressure, anisotropy indices, brittleness/ductility, Poissons ratio), electronic, optical, and thermodynamic properties of novel boron-rich compounds B6X (X = S, Se) have been explored using density functional theory. The estimated structural lattice parameters were consistent with the prior report. The mechanical and dynamical stability of these compounds have been established theoretically. The materials are brittle in nature and elastically anisotropic. The value of fracture toughness, KIC for the B6S and B6Se are ~ 2.07 MPam0.5, evaluating the resistance to limit the crack propagation inside the materials. Both B6S and B6Se compounds possess high hardness values in the range 31-35 GPa, and have the potential to be prominent members of the class of hard compounds. Strong covalent bonding and sharp peak at low energy below the Fermi level confirmed by partial density of states (PDOS) resulted in the high hardness. The profile of band structure, as well as DOS, assesses the indirect semiconducting nature of the titled compounds. The comparatively high value of Debye temperature (ΘD), minimum thermal conductivity (Kmin), lattice thermal conductivity (kph), low thermal expansion coefficient, and low density suggest that both boron-rich chalcogenides might be used as thermal management materials. Large absorption capacities in the mid ultraviolet region (3.2-15 eV) of the studied materials and low reflectivity (~16 %) are significantly noted. Such favorable features give promise to the compounds under investigation to be used in UV surface-disinfection devices as well as medical sterilizer equipment applications. Excellent correlations are found among all the studied physical properties of these compounds.

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