Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (10): 2143.doi: 10.7503/cjcu20190260

• Physical Chemistry • Previous Articles     Next Articles

High-temperature in situ Raman Spectroscopic Study on the Micro-structure of Bi4B2O9 Crystal and Melt

XU Yandong,YOU Jinglin(),WANG Jian,GONG Xiaoye,DING Yani,CAO Peiming,ZHENG Shaobo,WU Yongquan,YU Zhongda   

  1. State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
  • Received:2019-05-07 Online:2019-09-12 Published:2019-09-12
  • Contact: YOU Jinglin E-mail:jlyou@staff.shu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21773152);the Shanghai Committee of Science and Technology Fund, China(No.12520709200);the National 111 Project, China(No.D17002);the Open and Independent Project of State Key Laboratory of Advanced Special Steel, China(Nos.SKLASS2015-01);the Open and Independent Project of State Key Laboratory of Advanced Special Steel, China(Nos.SKLASS2017-02);the Special Fund Project of Shanghai Municipality for Science and Technology Development, China(No.YDZX20173100001316)

Abstract:

Raman spectrum of Bi4B2O9 crystal at ambient temperature was measured and calculated via density functional theory and vibration modes of all the peaks were assigned. Then high temperature in situ Raman spectroscopic technique was utilized to measure Raman spectra of Bi4B2O9 crystal from room temperature to 750 ℃(above the melting point) to investigate its micro-structure’s evolution. With the temperature increasing, the lattice lengthens in bond length and broadens in bond angle. After melting, BiO4 and BiO5 polyhedron in crystal tends to convert, while BO3 triangle stays constant. Ab initio method was used to simulate the microstructure of Bi4B2O9 melt cluster, calculate and analyze its Raman spectra. It is found that B atoms in Bi4B2O9 melt form isolated BO3 triangle structure and Bi 3+ cation among BO3, connecting O atoms out of BO3, functions as charge balancer.

Key words: Bi4B2O9 crystal, High temperature in situ Raman spectroscopy, Melt micro-structure, Ab initio calculation method

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