高压下G2ZT晶体结构、电子结构和光学性质的第一性原理研究

李佐 刘云 廖大麟 成丽红

李佐, 刘云, 廖大麟, 成丽红. 高压下G2ZT晶体结构、电子结构和光学性质的第一性原理研究[J]. 高压物理学报, 2022, 36(4): 042202. doi: 10.11858/gywlxb.20220514
引用本文: 李佐, 刘云, 廖大麟, 成丽红. 高压下G2ZT晶体结构、电子结构和光学性质的第一性原理研究[J]. 高压物理学报, 2022, 36(4): 042202. doi: 10.11858/gywlxb.20220514
LI Zuo, LIU Yun, LIAO Dalin, CHENG Lihong. First-Principles Study on Structural, Electronic and Optical Properties of G2ZT Crystal under High Pressure[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 042202. doi: 10.11858/gywlxb.20220514
Citation: LI Zuo, LIU Yun, LIAO Dalin, CHENG Lihong. First-Principles Study on Structural, Electronic and Optical Properties of G2ZT Crystal under High Pressure[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 042202. doi: 10.11858/gywlxb.20220514

高压下G2ZT晶体结构、电子结构和光学性质的第一性原理研究

doi: 10.11858/gywlxb.20220514
基金项目: 贵州省科技计划项目([2020]1Y023);贵州省教育厅青年科技人才成长项目(KY[2018]398)
详细信息
    作者简介:

    李 佐(1983-),男,硕士,讲师,主要从事高压下含能材料物性研究. E-mail:lizuo212@163.com

  • 中图分类号: O521.2

First-Principles Study on Structural, Electronic and Optical Properties of G2ZT Crystal under High Pressure

  • 摘要: 基于密度泛函理论的第一性原理研究了高压下富氮含能材料(双3, 4, 5-三氨基-1, 2, 4-三唑)-5, 5′-偶氮四唑(G2ZT)的几何结构、电子结构和光学性质。结果表明,在考虑范德瓦尔斯色散修正和密度泛函色散修正的情况下, 分子晶体结构数据与实验结果的相对误差均在3%以内。Hirshfeld表面分析结果表明,随着压强增大,分子间氢键的相互作用减弱。G2ZT晶体在零压下的能带带隙为2.03 eV,是一种p型半导体。随着压强增大,带隙变窄,吸收系数可达到3.0×106 cm−1。研究结果为进一步分析高压下G2ZT晶体的特征提供了理论参考。

     

  • 图  G2ZT晶体的晶胞结构和分子模型

    Figure  1.  Cell structure and molecular model of G2ZT crystal

    图  G2ZT晶体的晶格参数和体积比随压强的变化

    Figure  2.  Lattice parameters and V/V0 of G2ZT crystal versus pressure

    图  C2N10分子在0 GPa下的Hirshfeld面和二维指纹图

    Figure  3.  Hirshfeld surface and two-dimensional finger patterns of C2N10 molecule at 0 GPa

    图  C2N10分子在40 GPa下的Hirshfeld面和二维指纹图

    Figure  4.  Hirshfeld surface and two-dimensional finger patterns of C2N10 molecule at 40 GPa

    图  G2ZT晶体在不同压强下的能带色散关系

    Figure  5.  Energy band dispersion of G2ZT crystal at different pressures

    图  不同压强下G2ZT晶体的态密度分布

    Figure  6.  Distributions of DOS of G2ZT crystal at different pressures

    图  不同压强下G2ZT晶体的介电函数随入射能量的变化

    Figure  7.  Dielectric functions of G2ZT crystal versus incident energy at different pressures

    图  G2ZT晶体在0和40 GPa压强下的反射率随入射能量的变化

    Figure  8.  Reflection index of G2ZT crystal versus incident energy at 0 and 40 GPa

    图  G2ZT晶体在0和40 GPa压强下的折射率随入射能量的变化

    Figure  9.  Refraction index of G2ZT crystal versus incident energy at 0 and 40 GPa

    图  10  G2ZT晶体在0和40 GPa压强下的吸收系数随入射能量的变化

    Figure  10.  Absorption coefficient of G2ZT crystal versus incident energy at 0 and 40 GPa

    表  1  G2ZT晶格参数的计算结果和实验结果比较[2]

    Table  1.   Calculated crystal lattice parameters of G2ZT compared with experimental data[2]

    Methodabc$\alpha $/(°)$\,\beta $/(°)$\gamma $/(°)V3
    vdW-DF25.37336.604411.9931102.3691.14109.42390.1694
    PBE-D25.35406.792011.7190100.2391.80110.55390.6893
    Expt.[2]5.26196.698011.8840102.0590.80109.96383.3499
    $\delta $vdW-DF2/%2.10−1.40 0.92 0.300.37−0.491.80
    $\delta $PBE-D2/%1.70 1.40−1.40−1.801.10 0.531.90
    下载: 导出CSV

    表  2  三阶BM和Vinet物态方程拟合得到的G2ZT晶体的体弹模量及其一阶导数

    Table  2.   Bulk moduli and their pressure-derivatives of G2ZT crystal determined by third-order BM and Vinet equations of state

    MethodThird-order BM Vinet
    B0/GPa$B_0' $ B0/GPa$B_0' $
    PBE-D219.69±0.805.50±0.22 18.84±0.636.06±0.16
    vdW-DF227.58±0.764.85±0.14 26.48±0.665.39±0.13
    下载: 导出CSV

    表  3  不同压强下第一布里渊区高对称$k$点在价带顶$E_{\rm{v}}$和导带底$E_{\rm{c}} $的特征能量

    Table  3.   Characteristic energy values for top of valence band $E_{\rm{v}} $ and bottom of conduction band $E_{\rm{c}} $ in highly symmetric $k$ points of the first Brillouin region at different pressures

    Pressure/GPaEc/eV Ev/eV
    RΓXM RΓXM
    02.032.252.032.03 0.00−0.050.000.00
    31.732.011.731.730.00−0.040.000.00
    101.331.661.311.330.00−0.09−0.03 0.00
    400.931.460.810.91−0.04 −0.25−0.18 0.00
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-02-17
  • 修回日期:  2022-03-06
  • 录用日期:  2022-03-06
  • 网络出版日期:  2022-06-22
  • 刊出日期:  2022-07-28

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