吉林长白山硅藻土的红外光谱研究  

Infrared Spectroscopic Study of Changbaishan Diatomite

作　　者：肖万生[1] 彭文世[1] 王冠鑫[1] 王辅亚[1] 翁克难[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《光谱学与光谱分析》2004年第6期690-693,共4页Spectroscopy and Spectral Analysis

基　　金：中国科学院知识创新工程重要方向项目(KJCX2 SW N0 3)资助

摘　　要：对长白山硅藻土在 10 0～ 1330℃温度范围进行热处理并开展红外光谱研究 ,结果表明经 5 0 0℃热处理样品开始出现 374 5cm- 1 峰 ,在 90 0℃达到最大 ,12 0 0℃消失 ,此时硅藻土转变成方石英。对 374 5cm- 1 峰所反映的以孤立Si—OH形式存在的水的含量进行了半定量计算 ,表明这种OH除存在于样品表面外 ,还存在于内部的结构缺陷处 。Changbaishan diatomite was treated under the conditions of temperature from 100 to 1 330 degreesC, 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 degreesC 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 degreesC 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 degreesC 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 degreesC, and disappears at 1200 degreesC. 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.

关 键 词：吉林长白山硅藻土 红外光谱 热处理 硅-羟基基团 方石英 蛋白石-AG 

分 类 号：P578.494[天文地球—矿物学] P575.4[天文地球—地质学]