| 光谱学与光谱分析 |
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| Infrared Spectroscopic Study of Changbaishan Diatomite |
| XIAO Wan-sheng, PENG Wen-shi, WANG Guan-xin, WANG Fu-ya, WENG Ke-nan |
| Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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Abstract Changbaishan diatomite was treated under the conditions of temperature from 100 to 1 330 ℃, and examined by infrared spectroscopy applying the KBr-technique. In the range from 250 to 1 500 cm-1, the spectra of the samples at 100 to 1 100 ℃ show the same three characteristic broad bands at 1 100, 801 and 471 cm-1, which are similar to amorphous silica. Besides the above three broad bands, the spectra of 1 200 and 1 330 ℃ treated samples eｘhibit three new bands at 618, 386 and 301 cm-1, which indicate that the diatomite transforms into cristobalite. While all of the eleven samples show an asymmetric broad band at 3 440 cm-1 in the range from 3 000 to 4 000 cm-1, the spectrum of 500 ℃ treated sample begins to eｘhibit a 3 745 cm-1 band assigning to isolated Si—OH group stretching vibration. The 3 745 cm-1 band shows the highest intensity at 900 ℃, and disappears at 1 200 ℃. According to the absorbance of the 3 745 cm-1 band of different temperature treated samples, the H2O content in the form of Si—OH group was calculated semi-quantitatively, which indicates that the Si—OH group exists at the internal structure defects in addition to eｘisting at the surface. The transform mechanism of diatomite into cristobalite was also discussed.
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Received: 2002-12-28
Accepted: 2003-05-16
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Corresponding Authors:
XIAO Wan-sheng
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| Cite this article: |
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XIAO Wan-sheng,PENG Wen-shi,WANG Guan-xin, et al. Infrared Spectroscopic Study of Changbaishan Diatomite [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(06): 690-693.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2004/V24/I06/690 |
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