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首页> 外文期刊>Physica, B. Condensed Matter >Effects of aluminum vacancies on electronic structure and optical properties of Ta_4AlC_3: A first principles study
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Effects of aluminum vacancies on electronic structure and optical properties of Ta_4AlC_3: A first principles study

机译:铝空位对Ta_4AlC_3电子结构和光学性能的影响:第一个原理研究

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摘要

We investigated the effect of aluminum vacancies (V_(Al)) on the structural, electronic and optical properties of Ta_4Al _(1-x)C_3 (x=0, 0.25, 0.5, 0.75) based on the first-principle calculation using density functional theory. We found that the lattice constant a remains almost unchanged with the variation of V_(Al) concentration, while c and c/a ratio decrease with increasing V_(Al) concentration. Moreover V_(Al) induced local distortions have significant influence on the electronic and optical properties of Ta_4AlC_3, especially beyond the critical V_(Al) concentration (x=0.5). On the other hand, the presence of V_(Al) can improve the dielectric properties of Ta_4AlC_3. From the optical properties analysis, we predicted that Ta_4Al_(1-x)C_3 is not suitable as a coating material to avoid solar heating.
机译:我们基于密度的第一性原理研究了铝空位(V_(Al))对Ta_4Al _(1-x)C_3(x = 0,0.25,0.5,0.75)的结构,电子和光学性质的影响功能理论。我们发现,随着V_(Al)浓度的变化,晶格常数a几乎保持不变,而c和c / a比随着V_(Al)浓度的增加而降低。此外,V_(Al)引起的局部畸变对Ta_4AlC_3的电子和光学性能有重大影响,尤其是超过临界V_(Al)浓度(x = 0.5)时。另一方面,V_(Al)的存在可以改善Ta_4AlC_3的介电性能。从光学性质分析,我们预测Ta_4Al_(1-x)C_3不适合用作避免太阳热的涂层材料。

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