海泡石中水的红外光谱及其结构稳定性的指示作用  

Infrared Spectrum of Water in Sepiolite and Its Role of Indicating Structural Stability

作　　者：宋功保[1,2] 张建洪[1,2] 郭颖[1,2] 万朴[1,2] 彭同江[1,2] 董发勤[1,2] 

机构地区：[1]西南工学院矿物材料研究所 [2]中国地质大学材料学院

出　　处：《岩石矿物学杂志》1999年第1期80-86,共7页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金;国家建材行业基金

摘　　要：在仔细分析海泡石中水的红外谱图特点的基础上，本文对其结构水（ＯＨ）、结晶水（ＯＨ２）、沸石水（Ｈ２Ｏ）吸收带进行了逐个归属，并对比分析了热液型和沉积型海泡石谱图的差异。通过分析热处理海泡石样品红外谱图，发现热处理过程中谱图的变化特征与热相变过程能很好地吻合，论证了海泡石中水的红外光谱具有指示结构稳定性的作用。Based on analyzing the character of infrared specrum of water in the sepiolite structure, this paper assigned every infrared band of structure hydroxyl (OH), water of crystallization (OH 2) and zeolite water (H 2O). In high frequency area (3700～300 cm -1 ),the Mg-OH stretching absorption band ν Mg_OH is around 3680 cm -1 , the Al-OH stretching adsorption band ν Al-OH is around 3625 cm -1 , the stretching absorption band ν OH 2 of crystal water OH 2 is around 3560 cm -1 , the band ν H 2O of zeolite water and adsorption water H 2O is around 3400～3500 cm -1 , and the band around 3260 cm -1 is the band ν H_bound of hydrogen bond among water. In middle frequency area (1700～1600 cm -1 ), the band around 1640～1600 cm -1 is the bending vibration band δ H 2O of zeolite water and adsorption water, and band around 1615～1630 cm -1 is the bending vibration band δ OH 2 of crystal water. In low frequency are (700～600 cm -1 ), the band around 690 cm -1 is the librating band ρ Al-OH of Al-OH, and the band around 642 cm -1 is the librating band ρ Mg-OH of Mg-OH. Moreover, the authors have studied the difference in infrared spectra between hydrothermal sepiolite and sedimentary sepiolite, and found that ν Mg-OH of hydrothermal sepiolite is stronger than that of sedimentary sepiolite, while ν Al-OH of hydrothermal sepiolite is weaker than that of sedimentary sepiolite. By analyzing infrared spectrum of heated sepiolite, it is found that the variation character of infrared specrum of heated sepiolite is consistent with the phase change. Finally, the authors point out that infrared spectrum of water in the sepiolite plays the role of indicating structural stability.

关 键 词：海泡石 红外谱图 结构水 结晶水 结构稳定性 

分 类 号：P578.94[天文地球—矿物学]