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人工晶体学报 ›› 2022, Vol. 51 ›› Issue (3): 477-484.

• 研究论文 • 上一篇    下一篇

Ti3(ZnxAl1-x)C2固溶体热学、电学和力学性质的理论研究

邓斐然1, 徐敏1, 苗峰1, 黄毅1, 冯世全2, 宋明泽1, 肖晨达1, 林园园1, 李慧敏1   

  1. 1.西南民族大学电子信息工程国家民委重点实验室,成都 610041;
    2.郑州轻工业大学磁电信息功能材料重点实验室,郑州 450002
  • 收稿日期:2021-10-29 出版日期:2022-03-15 发布日期:2022-04-11
  • 通讯作者: 徐敏,博士,高级实验师。E-mail:mxu@swun.edu.cn
  • 作者简介:邓斐然(1997—),男,海南省人,硕士研究生。E-mail:17740963062@163.com
  • 基金资助:
    西南民族大学研究生创新型科研项目(Y74ZC5152G); 河南省青年骨干教师计划项目(2019GGJS137)

Theoretical Studies of the Thermal, Electronic and Mechanical Properties of Ti3(ZnxAl1-x)C2 Solid Solutions

DENG Feiran1, XU Min1, MIAO Feng1, HUANG Yi1, FENG Shiquan2, SONG Mingze1, XIAO Chenda1, LIN Yuanyuan1, LI Huimin1   

  1. 1. Key Laboratory of State Ethnic Affairs Commission for Electronic and Information Engineering, Southwest University for Nationalities, Chengdu 610041, China;
    2. Key Laboratory of Magnetoelectronic Information Functional Materials, Zhengzhou University of Light Industry, Zhengzhou 450002, China
  • Received:2021-10-29 Online:2022-03-15 Published:2022-04-11

摘要: 采用第一性原理的密度泛函理论平面波赝势法, 通过投影缀加波(PAW)和广义梯度近似(GGA)系统地研究了Ti3(ZnxAl1-x)C2的结构、能量、声子性质、电子性质和弹性性质。对MAX相Ti3AlC2晶体中A位置的Al元素用Zn元素进行替换掺杂,构建出Ti3(ZnxAl1-x)C2(x=0,0.25,0.5,0.75,1)固溶体结构模型。计算分析表明:在所研究的掺杂浓度范围内Ti3(ZnxAl1-x)C2均是热力学、动力学和力学稳定的脆性材料;此外,Ti3(ZnxAl1-x)C2(x=0,0.25,0.5,0.75,1)均呈现金属性,在费米能级处的电子态密度主要贡献来自Ti-3d态,同时具有离子键、共价键和金属键的综合性质。随着Zn原子掺杂浓度的增加,在一定程度上其导电性和塑性均增强。

关键词: Ti3(ZnxAl1-x)C2, MAX相, 低维晶态材料, 第一性原理, 电子性质, 弹性性质, 声子性质

Abstract: Using the first-principles density functional theory plane-wave pseudopotential method, the Ti3(ZnxAl1-x)C2 structure, energy, phonon properties, electronic properties and elastic properties were systematically studied by projector augmented wave (PAW) and generalized gradient approximation (GGA). The structure model of Ti3(ZnxAl1-x)C2(x=0, 0.25, 0.5, 0.75, 1) solid solutions were constructed by substituting Zn for Al element at A position in Ti3AlC2 crystal of MAX phase. The calculation analysis shows that Ti3(ZnxAl1-x)C2 solid solutions are a thermodynamic, dynamic and mechanically stable brittle material in the doping concentration range studied. In addition, Ti3(ZnxAl1-x)C2(x=0, 0.25, 0.5, 0.75, 1) solid solutions are metallic. The electronic density of states at Fermi level mainly contributes from the Ti-3d state, and possesses the comprehensive properties of ionic, covalent and metallic bonds. The conductivity and plasticity of Ti3(ZnxAl1-x)C2(x=0, 0.25, 0.5, 0.75, 1) solid solutions are enhanced to some extent with the increase of Zn doping concentration.

Key words: Ti3(ZnxAl1-x)C2, MAX phase, low dimensional crystalline material, first-principle, electronic property, elastic property, phonon property

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