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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (5): 841-849.DOI: 10.16553/j.cnki.issn1000-985x.2024.0256

• 研究论文 • 上一篇    下一篇

含d10电子构型钨酸盐结构与性能关系的第一性原理研究

崔健1,2(), 和志豪1,2, 丁家福1,2, 王云杰1,2, 万俯宏1,2, 李佳郡1,2, 苏欣1,2()   

  1. 1.伊犁师范大学物理科学与技术学院,伊宁 835000
    2.伊犁师范大学新疆凝聚态相变与微结构实验室,伊宁 835000
  • 收稿日期:2024-10-27 出版日期:2025-05-15 发布日期:2025-05-28
  • 通信作者: 苏欣,博士,副教授。E-mail:suxin_phy@sina.com
  • 作者简介:崔健(2001—),男,河北省人,硕士研究生。E-mail:798587442@qq.com
  • 基金资助:
    新疆维吾尔自治区重点实验室开放课题(2023D04074);伊犁师范大学科研项目(22XKZZ21);伊犁师范大学大学生创新训练项目(S202210764014);伊犁师范大学大学生创新训练项目(S202210764016);伊犁师范大学大学生创新训练项目(S202210764015)

First-Principles Study on the Relationship Between Structure and Properties of Tungstate with d10 Electron Configuration

CUI Jian1,2(), HE Zhihao1,2, DING Jiafu1,2, WANG Yunjie1,2, WAN Fuhong1,2, LI Jiajun1,2, SU Xin1,2()   

  1. 1. School of Physical Science and Technology,Yili Normal University,Yining 835000,China
    2. Xinjiang Laboratory of Phase Transitions and Microstructures of Condensed Matter Physics,Yili Normal University,Yining 835000,China
  • Received:2024-10-27 Online:2025-05-15 Published:2025-05-28

摘要: 本文基于第一性原理方法对比研究了钨酸盐TMWO4(TM=Zn、Cd、Hg)的电子结构和光学性质。研究结果表明,ZnWO4、CdWO4和HgWO4三种钨酸盐的带隙均为直接带隙,带隙宽度分别为2.579、2.081和2.538 eV。三种钨酸盐价带顶部主要由O-2p态贡献,由于杂化效应,O-2p态和W-5d态共同组成导带底部。键布居数和电子局域函数表明,存在两种W—O键,W—O1长键为离子键,W—O2短键为共价键,金属阳离子(Zn、Cd、Hg)与O原子形成离子键。同种钨酸盐在不同方向上的介电函数都表现出差异,较大的Δε对双折射率Δn有积极的影响。随着d10电子构型金属阳离子的半径增大,钨酸盐的双折射率减小,在1 064 nm处ZnWO4、CdWO4和HgWO4的双折射率分别为0.192、0.187和0.078,其中ZnWO4和CdWO4的双折射率和各向异性在三种体系中较大。

关键词: 钨酸盐; 第一性原理; 电子结构; 光学性质; 双折射率

Abstract: This study is based on the first-principles method to comparatively study the electronic structure and optical properties of tungstate TMWO4 (TM=Zn, Cd, Hg). The research results show that ZnWO4, CdWO4 and HgWO4 are all direct band gap materials, and the band gap widths are 2.579, 2.081 and 2.538 eV. The top of the valence band of the three compounds is mainly contributed by the O-2p state. Due to the hybridization effect, the O-2p state and the W-5d state form the bottom of the conduction band together. Analysis of the bond population and electron localization function shows that, there are two kinds of W—O bonds, of which the W—O1 long bond is ionic bond, and the W—O2 short bond is covalent bond; the metal cations form ionic bonds with O atoms.Each type of tungstate exhibits differences in dielectric functions at different directions. A larger Δε has a positive impact on the birefringence Δn. As the radius of the metal cation with d10 electronic configuration increases, the birefringence of the crystal decreases. The birefringence of ZnWO4, CdWO4 and HgWO4 are 0.192, 0.187 and 0.078 at 1 064 nm. Among the three systems, ZnWO4 and CdWO4 show larger birefringence and anisotropy.

Key words: tungstate; first-principle; electronic structure; optical property; birefringence

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