激光与光电子学进展, 2019, 56 (2): 023003, 网络出版: 2019-08-01
粉色蛋白石中“水”的热变异行为研究 下载: 976次
Thermal Variation of “Water” in Pink Opals
光谱学 红外光谱 粉色蛋白石 坡缕石 热变异行为 spectroscopy infrared spectroscopy pink opals palygorskite thermal variation behavior
摘要
粉色蛋白石为蛋白石和坡缕石的矿物集合体,该类蛋白石的矿物组成和谱学特征与传统的具有变彩效应的蛋白石有着明显的差异。采用常温或变温红外光谱、差热分析等分析测试方法,就粉色蛋白石的热变异行为等问题进行了初步探讨与研究。结果表明:粉色蛋白石红外吸收谱带表征了硅氧化物蛋白石和硅酸盐矿物坡缕石的振动特点,其结构水伸缩振动所致的红外吸收谱带主要表征为4000~3000 cm
-1范围内一组强度不一的红外吸收谱带。结构水、结晶水以及吸附水倍频、合频组合频振动所致的红外吸收谱带主要集中于8000~4000 cm
-1范围内。随着温度的升高,吸收谱带的相对吸收强度呈下降趋势,吸收峰也出现了不同程度的漂移、分裂或者新增,这说明—OH的结合与Si
4+无关,而与坡缕石中的Mg
2+、Al
3+、Fe
2+、Fe
3+相关。
Abstract
The pink opal is a mineral aggregation of opal and palygorskite. The minerals composition and spectral characteristics of the opal have a significant difference with the traditional opal of play of color. The thermal variation behaviors of the pink opal are studied by means of differential thermal analysis and Fourier transform infrared spectroscopy (FTIR) under room temperature or variable temperature. The results show that the infrared absorption band of the pink opal characterizes the vibrational characteristics of silicate minerals palygorskite and silico oxide opal. The infrared absorption band caused by the structural water expansion vibration is mainly characterized by a group of infrared absorption bands with different intensities in the range of 4000-3000 cm
-1. The infrared absorption band caused by sum frequency and frequency doubling of vibration frequency of structural water, crystalline water and adsorptive water is mainly concentrated in the range of 8000-4000 cm
-1. With the increase of temperature, the relative absorption intensity of the absorption band is decreasing, and the absorption peaks also have different degrees of drift, splitting or addition. It shows that the binding of —OH has no relation to Si
4+, and is related to Mg
2+, Al
3+, Fe
2+ and Fe
3+ in palygorskite.
邢莹莹, 亓利剑. 粉色蛋白石中“水”的热变异行为研究[J]. 激光与光电子学进展, 2019, 56(2): 023003. Yingying Xing, Lijian Qi. Thermal Variation of “Water” in Pink Opals[J]. Laser & Optoelectronics Progress, 2019, 56(2): 023003.