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arXiv 1206.4277cond-mat.mtrl-sci
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金属氮化物XN(X = Sc,Y)的电子、结构和弹性性质:第一性原理研究

Electronic, structural, and elastic properties of metal nitrides XN (X = Sc, Y): A first principle study

C. E. Ekuma, D. Bagayoko, M. Jarrell, J. Moreno

摘要:

我们利用一个简单的,强大的,第一原理方法,基于基组优化与BZW-EF方法,研究过渡金属单氮化物的电子和相关性质:ScN和YN。我们解决了KS系统的方程自洽内的线性组合的原子轨道(LCAO)形式主义。结果表明,带隙和低能量导带,以及弹性和结构性能,可以计算出合理的精度时,LCAO形式主义是用来获得最佳的基础。我们计算的ScN的间接电子带隙(E $^\mathrm{Γ-X}_g$)为0.79(LDA)和0.88 eV(GGA)。在YN的情况下,我们预测间接带隙(E $^\mathrm{Γ-X}_g$)为1.09(LDA)和1.15 eV(GGA)。我们还计算了两个系统的平衡晶格常数,体积模量(B $_{o}$),有效质量和弹性常数。我们的计算值与实验值非常吻合,后者是可用的。

英文摘要:

We utilized a simple, robust, first principle method, based on basis set optimization with the BZW-EF method, to study the electronic and related properties of transition metal mono-nitrides: ScN and YN. We solved the KS system of equations self-consistently within the linear combination of atomic orbitals (LCAO) formalism. It is shown that the band gap and low energy conduction bands, as well as elastic and structural properties, can be calculated with a reasonable accuracy when the LCAO formalism is used to obtain an optimal basis. Our calculated, indirect electronic band gap (E$^\mathrm{Γ-X}_g$) is 0.79 (LDA) and 0.88 eV (GGA) for ScN. In the case of YN, we predict an indirect band gap (E$^\mathrm{Γ-X}_g$) of 1.09 (LDA) and 1.15 eV (GGA). We also calculated the equilibrium lattice constants, the bulk moduli (B$_{o}$), effective masses, and elastic constants for both systems. Our calculated values are in excellent agreement with experimental ones where the latter are available.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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