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arXiv 1206.3631cond-mat.mtrl-sci
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新合成的Ti5Al2C3:电子和光学性质的第一性原理研究

Newly synthesized Ti5Al2C3: Electronic and optical properties by first-principles method

M. S. Ali, A. K. M. A. Islam, M. A. Hossain

摘要:

采用广义梯度近似下的第一性原理赝势平面波方法,对新发现的MAX相Ti 5Al 2C 3进行了理论研究.其能带结构和光学性质均为首次报道。可以看出,Ti的3d电子主要贡献的DOS在费米能级,并应参与导电性能。计算并讨论了Ti_5Al_2C_3的光学性质参数(介电函数、吸收谱、电导率、能量损失谱和反射率)。该材料具有130的大的正静态介电常数,这表明它是良好的介电材料。此外,Ti 5Al 2C 3的反射率在红外-可见-UV区域中高达~ 9.7eV,显示出作为避免太阳能加热的良好涂层材料的前景。关键词:A:Ti 5Al 2C 3; B:第一性原理; C:电子结构; C:光学性质

英文摘要:

A theoretical study of the newly identified Ti5Al2C3 belonging to the MAX phases has been performed by using the first-principles pseudopotential plane-wave method within the generalized gradient approximation (GGA). The energy band structure and optical properties are reported for the first time. It is seen that Ti 3d electrons mainly contribute to the DOS at the Fermi level, and should be involved in the conduction properties. The parameters of optical properties (dielectric function, absorption spectrum, conductivity, energy-loss spectrum and reflectivity) for Ti5Al2C3 are calculated and discussed. The material has a large positive static dielectric constant of 130 which indicates it to be a good dielectric material. Further the reflectivity of Ti5Al2C3 is high in the infrared-visible-UV region up to ~ 9.7 eV showing promise as a good coating material to avoid solar heating. Keywords: A: Ti5Al2C3; B: First-principles; C: Electronic structure; C: Optical properties

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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