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First-principles study on electronic structure and elastic properties of Fe _(16)N _2

机译:Fe _(16)N _2的电子结构和弹性性质的第一性原理研究

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We have performed first-principles study on structural stability, elastic properties and electronic structure of Fe _(16)N _2 by applying LSDAU method. The calculated values of formation energy and reaction enthalpy for decomposition reaction indicate that Fe _(16)N _2 is a thermodynamically stable phase at the ground state. The six independent elastic constants are derived and the bulk modulus, Youngs modulus, shear modulus, and Poissons ratio are determined as 180 GPa, 199 GPa, 76 GPa and 0.32, respectively. The elastic constants meet all the mechanical stability criteria. The ductility of Fe _(16)N _2 is predicted by Pughs criterion. The strong bonding between Fe and N atoms results in high values of elastic constants C _(11) and C _(33), and contributes to the strengthening of the Fe _(16)N _2 structural stability. The total and partial densities of states (DOS) suggest the existence of hybridization between N-p and Fe-d bands. The position of the Fermi level in DOS curve implies that Fe _(16)N _2 is a metastable phase.
机译:采用LSDAU方法对Fe _(16)N _2的结构稳定性,弹性和电子结构进行了第一性原理研究。分解反应的形成能和反应焓的计算值表明Fe _(16)N _2是基态的热力学稳定相。导出六个独立的弹性常数,并将体积模量,杨氏模量,剪切模量和泊松比分别确定为180 GPa,199 GPa,76 GPa和0.32。弹性常数满足所有机械稳定性标准。 Fe _(16)N _2的延性通过Pughs准则进行预测。 Fe和N原子之间的牢固键合导致高的弹性常数C _(11)和C _(33),并有助于增强Fe _(16)N _2的结构稳定性。状态的总密度和部分密度(DOS)表明N-p和Fe-d波段之间存在杂交。费米能级在DOS曲线中的位置表明Fe _(16)N _2是亚稳相。

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