物理化学学报 >> 1999, Vol. 15 >> Issue (05): 454-457.doi: 10.3866/PKU.WHXB19990513

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无定型氧化硅转变为α-方石英的振动光谱

陈宏善, 季生福, 牛建中, 谢宝汉, 李树本   

  1. 中国科学院兰州化学物理研究所,羟基合成与选择氧化国家重点实验室,兰州 730000
  • 收稿日期:1998-05-04 修回日期:1998-09-14 发布日期:1999-05-15
  • 通讯作者: 李树本

Vibration Spectroscopy on Transformation of Amorphous Silica to α-cristobalite

Chen Hong-Shan, Ji Sheng-Fu, Niu Jian-Zhong, Xie Bao-Han, Li Shu-Ben   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou 730000
  • Received:1998-05-04 Revised:1998-09-14 Published:1999-05-15
  • Contact: Li Shu-Ben

关键词: 无定型二氧化硅, α-方石英, 红外和喇曼光谱

Abstract:

 By calculating commercial silica at 1500℃ or adding sodium oxalate and calcinating at 850℃, α-cristobalite was obtained. The Raman and IR spectra of amorphous silica and α-cristobalite were studied. The Raman and IR spectra showed obvious changes. While amorphous silica transformed to α-cristobalite. The peak positions and peak shape changed, and new vibration mode appeared in the crystal phase. For amorphous silica, the Raman spectrum has a broad band between 210-515 cm- 1 and two weak peaks at 793 and 966 cm -1. After phase transition, the broad band split into two strong peaks at 416 and 231 cm-1, and the positions of weak peaks changed. The IR spectrum of SiO2 has two strong peaks at about 1100 and 480 cm-1 and a weak peak at 800 cm-1. For α-cristobalite, a strong new peak appeared at 620 cm-1, and the adsorption at 800 cm-1 increased considerably. α-cristobalite also has two adsorption peaks in far-infrared.

Key words: Amorphous silica, α-cristobalite, IR and Raman spectroscopy