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Citation: Chen Hong-Shan, Ji Sheng-Fu, Niu Jian-Zhong, Xie Bao-Han, Li Shu-Ben. Vibration Spectroscopy on Transformation of Amorphous Silica to α-cristobalite[J]. Acta Physico-Chimica Sinica, ;1999, 15(05): 454-457. doi: 10.3866/PKU.WHXB19990513 shu

Vibration Spectroscopy on Transformation of Amorphous Silica to α-cristobalite

1.
State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou 730000

Received Date: 4 May 1998
Available Online: 15 May 1999

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.
- Amorphous silica,
- α-cristobalite,
- IR and Raman spectroscopy
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