无定型氧化硅转变为α-方石英的振动光谱  

Vibration Spectroscopy on Transformation of Amorphous Silica to-cristobalite

作　　者：陈宏善[1] 季生福[1] 牛建中[1] 谢宝汉[1] 李树本[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,兰州730000

出　　处：《物理化学学报》1999年第5期454-457,共4页Acta Physico-Chimica Sinica

摘　　要：By calcinatng conunerial silica at 1500 t or adding sodium oxalate and calcinating at 85Ot, α-cristobalite was obtained. The Raman and IR spectra of arnorphous silica and α-cristobalite were studied. The Raman and IR spectra showed obvious changes. While amorphous silica transformed to α-cristobalite. The peak posihons 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 tfansition, 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.By calcinatng conunerial silica at 1500 t or adding sodium oxalate and calcinating at 85Ot, α-cristobalite was obtained. The Raman and IR spectra of arnorphous silica and α-cristobalite were studied. The Raman and IR spectra showed obvious changes. While amorphous silica transformed to α-cristobalite. The peak posihons 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 tfansition, 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.

关 键 词：无定型 二氧化硅 方石英 光谱 转变 

分 类 号：O613.72[理学—无机化学]