石膏及其热转变产物的红外光谱  

INFRARED SPECTRA OF GYPSUM AND ITS THERMAL TRANSFORMATION PRODUCTS

作　　者：彭文世[1] 刘高魁[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《矿物学报》1991年第1期27-32,共6页Acta Mineralogica Sinica

摘　　要：本文给出了石膏及其热转变产物——烧石膏和硬石膏的红外光谱。在晶体结构资料基础上,对石膏和硬石膏分别进行了因子群分析和位置群分析,其结果清楚地表明,理论预测的光谱与实测光谱相当一致。根据烧石膏的红外光谱和位置群分析的结果可以肯定,SO_4^(2-)离子的位置对称性不可能是D_2,只能为C_2或C_(10)热转变产物的红外光谱表明,石膏—烧石膏和烧石膏—硬石膏之间的热转变温度分别为80—100℃和350—400℃。Presented in this paper are the infrared spectra of gypsum and its thermal transformation products——bassanite and anhydrite. Based on the crystal structure data,the factor group analyses of gypsum and anhydrite were carried out, respectively. The results indicate that the infrared spectra deduced from the group theory are in good coincidence with those measured by us. From the infrared spectra and site group analyses of bassanite it can be seen that the site symmetry of SO_4^(2-) could not be D_2, but only C_2 or C_1. The thermal transformation temperature of gypsum into bassanite and bassanite into anhydrite are 80—100℃ and 350—400℃, respectively.

关 键 词：硫酸盐 热相变 红外光谱 烧石膏 硬石膏 晶体结构 因子群 位置群分析 

分 类 号：P578.72[天文地球—矿物学]