宝石级钠沸石的振动光谱表征  

Study on Vibrational Spectra Characteristics of Gem-Quality Natrolite

作　　者：刘衔宇[1,2,3] 沈锡田 卢靭 赵珊茸[4] 

机构地区：[1]中国地质大学地球物理与空间信息学院地球内部多尺度成像湖北省重点实验室,湖北武汉430074 [2]中国地质大学(武汉)珠宝学院,湖北武汉430074 [3]中国地质大学(武汉)地质过程与矿产资源国家重点实验室,湖北武汉430074 [4]中国地质大学(武汉)地球科学学院,湖北武汉430074

出　　处：《光谱学与光谱分析》2015年第8期2186-2188,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41372058)资助

摘　　要：国际珠宝交易市场上最近出现了一批价值不菲的无色透明的宝石级钠沸石刻面成品,为提供快速区分其与仿制品材料的依据,文章通过红外光谱和拉曼光谱对三颗钠沸石样品的振动光谱进行了研究。结果表明,其红外光谱主要表现为：4 000～1 200cm^-1的吸收峰是结构中水导致的吸收;1 200～600cm^-1的强吸收与TO4四面体的内部T—O（T为Si或Al）的反对称和对称伸缩振动有关。拉曼光谱散射峰主要分布在300～600和700～1 200cm^-1两个区间。300～360cm^-1处较弱强度的拉曼散射峰是由于结构中水分子所导致。482cm^-1处中等强度的峰归属于硅氧四面体内部由于变形导致的拉曼位移。726cm^-1处的拉曼散射峰归属于Al—O的伸缩振动;974,1 038,1 084cm^-1的三处拉曼散射峰都是Si—O的伸缩振动导致的拉曼位移。Recently,there is a batch of colorless faceted gem-quality natrolite appear in the international jewelry market.In order to provide some information that can help us to distinguish them from the imitations.The infrared spectrometer and Raman spectrometer were employed to study the characteristics of the vibrational spectrum of three natrolite samples in this article.The typical infrared spectra shows that：the absorption region 4 000～1 200cm^-1 is induced by stretching vibration of the hydroxyl group,the strong absorption peaks range from 1 200～600cm^-1 are relative with the anti-symmetry and symmetry stretching vibration of tetrahedral T—O bonds（T=Si or Al）.The Raman spectra scattering peaks are located in the range of 300～600and700～1 200cm^-1.The low intensity Raman scattering spectrum in the range of 300～360cm^-1 corresponds to the vibration of the water molecules in the crystal.The medium intensity Raman scattering spectrum is assigned to the deformation of SiO4 tetrahedra.The Raman spectra scattering peak at 726cm^-1 is assigned to the stretching vibration of Al—O;The Si—O stretching vibration displays the Raman spectra scattering peaks at 974,1 038 and 1 084cm^-1.

关 键 词：宝石级钠沸石 红外光谱 激光拉曼光谱 

分 类 号：O657.3[理学—分析化学]