软玉中结构水类型和近红外光谱解析  

A Resolution to the Hydroxy Types of Nephrite and Its Near Infrared Spectroscopy

作　　者：支颖雪[1,2,3] 廖宗廷[2,3] 周征宇[1,2,3] 招博文[2,3] 王宾[2,3] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]上海宝石及材料工艺工程技术研究中心,上海200092 [3]同济大学海洋与地球科学学院,宝石及工艺材料实验室,上海200092

出　　处：《光谱学与光谱分析》2013年第6期1481-1486,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41140023;41272049;49772096)资助

摘　　要：利用傅里叶变换近红外光谱分析技术,对源自国内外不同产地的软玉进行了测试与分析。结果表明在7 000～7 400cm-1波数范围内,部分产地的软玉中出现四个由羟基倍频振动致近红外吸收谱带,分别归属OH(Mg MgMg),OH(MgMgFe2+),OH(MgFe2+Fe2+),OH(Fe2+Fe2+Fe2+)的倍频振动所致,并与软玉中透闪石矿物晶体结构中M1和M3位置的Mg2+,Fe2+占位有关。随着透闪石中Fe2+/(Fe2++Mg2+)比值的增大,亦可导致软玉中羟基NIR谱带的进一步分裂,谱带数目和强度增加,并向低波数方向位移。文中对软玉中羟基NIR光谱的产地鉴别意义一并给予了讨论。Nephrite samples coming from various origins were investigated using Fourier transform near-infrared spectroscopy （FTNIR）. The result shows that samples from some specific origins display four absorption bands of OH stretching vibrations in the 7 000- 7 400 cm^-1 region, which are ascribed to overtone vibrations respectively of OH（MgMgMg）, OH（MgMgFe^2＋ ）, OH（MgFez＋ Fez＋ ） and OH（Fe^2＋ Fe^2＋ Fe^2＋ ）, are related to Mg^2＋ and Fe^2＋ion located in M1 and M3 positions of tremolite crys talline structure. With the raise of Fe^2＋/（Fe^2＋＋Mg^2＋） ratio in tremolite, splitting and redshift of OH vibration bands proceed, gaining an increase in wavenumber, band number and band intensity. Significance of the OH NIR spectra in nephrite origin identification is discussed.

关 键 词：软玉 近红外光谱 结构水 产地鉴别 

分 类 号：O657.3[理学—分析化学]