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JOURNAL OF SYNTHETIC CRYSTALS ›› 2022, Vol. 51 ›› Issue (3): 477-484.

• Research Articles • Previous Articles     Next Articles

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

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

CLC Number: