蒙脱石晶体结构和水结构的矿物物理特征  

THE MINERAL PHYSICS CHARACTERISTICS OF CRYSTAL STRUCTURE AND WATER STRUCTURE IN THE MONTMORILLONITE

作　　者：徐培苍[1] 张晓云[1] 李如璧[1] 王永强[1] 侯弘 李树德 

机构地区：[1]中国地质科学院西安地质矿产研究所 [2]西安高压电瓷厂

出　　处：《中国地质科学院西安地质矿产研究所所刊》1991年第32期14-32,共19页

摘　　要：本文利用矿物物理研究方法对我国内蒙、浙江、甘肃等地的钙基、钠基、镁基蒙脱石的物质成分、晶体结构和层间OH,H_2O的排布结构进行了研究,并获得下列结论: 1.由X衍射和拉曼分子光谱分析深入研究了蒙脱石阳离子配位体结构特征,提出其空间群为C_(2/m) 型。 2.建立了蒙脱石水结构模式,有3种主要类型:①层间大阳离子附近的束缚态水分子;②层间无大阳离子位置上的非束缚态水分子;③颗粒表面依靠氢键相连的水分子集合体。 3.利用群理沦,提出了蒙脱石OH～-的振动模式,由振动分析指出蒙脱石中OH～-具有12个振动模式。In this paper, the composition, crystal structure and water OH-H_2O arrange structure between layers of calcium sodium magnesium montmorillonites in Neimeng, Zhejiang, Gansu, in china have been investigated by means of mineral physical methods. The following conclusions were obtained. 1.The structure characteristics of cation coordination polyhedron in the montmorillonites were deeply studied by X-ray diffraction and Raman molecular spectrum. Then the space group of montmorillonite of C_(2/m) type is put forward. 2.The water structure of montmorillonite was established, three kinds of water structure: (1)The binding water molecule is near big cation between layers. (2) The nonbinding water molecule is on the site where there are no big cations between layers. (3)The water molecule aggregate on the surface of clay grains is with combination of hydrogen bond each other. 3.The OH- vibration types of montmorillonite were advanced by analysis of group theory. Vibrational analysis indicates that the OH-tetrahedral in montmorillonite has 12 vibrational models. Γvib=5A+7B.

关 键 词：蒙脱石 晶体结构 水结构 矿物 

分 类 号：P578.967[天文地球—矿物学]