四川蛇纹石猫眼的谱学特征及呈色机理研究  

STUDY ON THE SPECTROSCOPY AND COLORATION MECHANISM OF SERPENTINE CAT'S EYES

作　　者：卢保奇[1] 亓利剑[2] 夏义本[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]中国地质大学珠宝学院,武汉430074

出　　处：《硅酸盐学报》2005年第5期572-575,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(49772096);上海市教育委员会发展基金(03AK23)资助项目。

摘　　要：用Fourier变换红外光谱、激光Raman光谱、紫外可见吸收光谱和电子顺磁共振吸收谱对四川蛇纹石猫眼进行了研究。结果表明:四川蛇纹石猫眼可分为纤蛇纹石和叶蛇纹石2种类型,两者在960～1026cm-1和3600～3690cm-1的Raman光谱范围内由Si—O伸缩振动的E1类振动和OH伸缩振动与红外谱带分裂强度及谱带特征之间存在明显的差异。OH伸缩振动红外谱带的分裂,并向低波数方向位移主要与Fe的含量增加有关。Fe3+占位于蛇纹石晶格中四面体和八面体位置。Mn2+占位于八面体位置,并类质同象置换Mg2+。Fe3+的dd电子跃迁是蛇纹石猫眼致色的主要因素。Fourier transform infrared (FTIR) spectroscopy, absorption spectra, Raman spectra, ultraviolet-visible light absorption spectra and electron paramagnetic resonance (EPR) were used to study serpentine cat's eye from Sichuan province. The results indicate that serpentine cat's eyes can be divided into two types: chrysotile and antigorite, which have the obvious difference on the split intensity and characteristic of their infrared spectral bands in the region around 960-1026 cm-1 and 3600-3690 cm-1 of Si-O E1 stretching vibration and OH stretching vibration region. The OH stretching vibration in infrared spectra splits into two absorption bands and shifts to the low wave number, that has related to the increasing amount of Fe ion. Fe3+ occupies in the position of both tetrahedron and octahedron of serpentine, while Mn2+ exists only at the octahedron in the lattice of serpentine, taking the place of Mg2+. The d-d electrons transition of Fe3+ is the major cause for the coloration of serpentine cat's eyes from Sichuan province.

关 键 词：蛇纹石猫眼 呈色机理 光谱特性 电子顺磁共振谱 

分 类 号：P619.28[天文地球—矿床学]