应用化学 ›› 2023, Vol. 40 ›› Issue (2): 229-235.DOI: 10.19894/j.issn.1000-0518.220225

• 研究论文 • 上一篇    下一篇

银簇化合物Ag3B6O10I的合成、晶体结构和双折射性质

杜志鹏, 周洋, 赵三根()   

  1. 中国科学院福建物质结构研究所,结构化学国家重点实验室,福州 350002
  • 收稿日期:2022-06-26 接受日期:2022-09-04 出版日期:2023-02-01 发布日期:2023-02-27
  • 通讯作者: 赵三根
  • 基金资助:
    国家自然科学基金(22122507);中国科学院前沿科学重点研究计划(ZDBS-LY-SLH024);国家重点研发计划(2019YFA0210400)

Synthesis, Crystal Structure and Birefringence Properties of Silver Cluster Compound Ag3B6O10I

Zhi-Peng DU, Yang ZHOU, San-Gen ZHAO()   

  1. State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China
  • Received:2022-06-26 Accepted:2022-09-04 Published:2023-02-01 Online:2023-02-27
  • Contact: San-Gen ZHAO
  • About author:zhaosangen@fjirsm.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22122507);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LY-SLH024);the National Key Research and Development Program of China(2019YFA0210400)

摘要:

通过高温固相合成技术,成功合成了一种新型含银簇卤化硼酸盐Ag3B6O10I。该晶体属正交晶系,空间群为Pnma (No.62)。结构分析表明,该晶体结构中BO4四面体和BO3三角形连接形成[B6O102-并最终相互连接形成三维孔洞结构,Ag3I三角锥位于孔洞中。这种基于B6O10基元的含银簇三维孔洞结构为首次报道。热稳定性分析表明Ag3B6O10I为非同成分熔融化合物,熔融分解温度为963 K。紫外-可见-近红外漫反射光谱分析显示该晶体光学带隙约为3.1 eV。值得关注的是,Ag3B6O10I晶体具有较大的双折射率(0.031@550 nm)。第一性原理理论计算揭示了该晶体的光学特性来源。

关键词: 硼酸盐, 银簇化合物, 晶体结构, 双折射率, 第一性原理计算

Abstract:

Birefringent crystals that can modulate the polarization of light play a significant role in modern optical devices including polarizing microscopes, optical isolators, and achromatic quarter-wave plates. Here we report a new silver cluster compound, Ag3B6O10I, which features a three-dimensional pore structure formed by the connection of [B6O102- fundamental structural units, with the Ag3I triangular pyramidal located in the pores. This structure with [B6O102- as the basic unit is reported in silver cluster borate for the first time. This compound crystallizes in the Pnma (No.62) space group with a=1.2741(3) nm, b=0.97378(19) nm, c=0.83971(17) nm. It is a non-congruent melting compound and can be stable below 963 K. Notably, Ag3B6O10I has a wide band gap (>3.1 eV), and exhibits a large linear optical response, that is, birefringence of Δn=0.031 at the wavelength of 550 nm. Moreover, the structure-property relationships in Ag3B6O10I are analyzed by first-principles calculations. This work suggests new possibilities for the design and fabrication of advanced birefringent crystals using the silver cluster.

Key words: Borates, Silver cluster, Crystal structure, Birefringence, First-principles calculations

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