First-principles prediction of electronic, optical, and thermodynamic properties of c-TiAl3 with M doping (M = V, Nb, Ta)

被引:2
作者
Wang, Liqiong [1 ]
Cao, Yong [1 ]
Zhou, Shenggang [1 ]
机构
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China
基金
中国国家自然科学基金;
关键词
First-principles; c-TiAl3; Doping; Electronic properties; Optical properties; Thermodynamic properties; STRUCTURAL-PROPERTIES; MECHANICAL-PROPERTIES; MICROSTRUCTURE; STABILITY; D0(22); PHASES;
D O I
10.1007/s12648-023-02656-5
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In order to explore the neotype functional properties contained in transition metal elements-doped L1(2)-type TiAl3 materials, we used the first-principles calculation method based on density functional theory (DFT) to study systematically the electronic, optical, and thermodynamic properties of c-TiAl3 with M doping (M = V, Nb, Ta). The calculation results of formation enthalpies ?H-f and the density of states showed that these seven phases are thermodynamically stable, and the order of thermodynamic stability is Ti8Al23M > c-TiAl3 > Ti7Al24M. The research of electronic properties showed that these seven phases are all metallic, and the order of conductivity is Ti8Al23M > Ti7Al24M > cTiAl(3). The research results of optical properties showed that these seven phases are also metallic. After M atoms are doped with c-TiAl3, the dielectric properties and conductivity of the doping system are improved, and the order of the dielectric properties and conductivity is consistent with the result of electronic properties. Therefore, their application potential in optoelectronic materials is extremely high. Finally, we use the quasi-harmonic Debye model to study the thermodynamic properties of these seven phases in the pressure range of 0-40 GPa and the temperature range of 0-1200 K, including heat capacity (C-V, C-P), thermal expansion coefficient (a), and Debye temperature (?(D)).
引用
收藏
页码:2943 / 2960
页数:18
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