福建明溪蓝宝石的谱学特征及颜色成因  

SPECTROSCOPY AND COLOURATION OF SAPPHIRES FROM MINGXI, FUJIAN

作　　者：汤德平[1] 江爱耕[1] 段建平[1] 杨齐愉[1] 

机构地区：[1]福州大学,福州350002

出　　处：《矿物学报》1998年第4期533-540,共8页Acta Mineralogica Sinica

基　　金：福建省科委资助!95-R-13

摘　　要：采用颜色测量、紫外-可见光谱、红外光谱等方法对福建明溪蓝宝石进行的研究表明，明溪蓝宝石颜色蓝中带黄，二色性强。紫外-可见吸收光谱中377，388和451nm吸收带较强。这些吸收带是Fe3+的d－d和Fe3+—Fe3+，交换相合离子间的电子跃迁引起的。810nm带存在于各色蓝宝石中，强度变化较大，有时伴随有510nm吸收带。它是由Fe2+—Fe3+电荷转移形成的。570nm吸收带只出现在蓝色或绿色的蓝宝石中。结合蓝宝石红外33loom－‘吸收带与宝石颜色之间的关系，笔者将570nm吸收带归属于H、Fe、Ti构成的致色缺陷团。这一研究结果对蓝宝石呈色机理的进一步研究和宝石的合成等具有重要意义。The chromatic, UV-Vis and IR spectroscopic studies of sapphires from Mingxi, Fujian,have been conducted. The sapphires have a blue color with yellow tone and stronger dichroism as compared to those sapphires from Shandong. 377, 388 and 451 nm absorption bands are assigned to d-d electron transition and pairs of Fe3+. An 810 nm band has been observed in the sapphires of different colors and its absorption varies from one to another sapphire. The stronger 810 nm band is accompanied by a weak 510 nm band and produces blue or green color. It has been attributed to Fe2+ seFe3+ intervalence change transfer. The blue color of the sapphires from Mingxi is due to 570 nm band. Also, IR study shows that the 3 310 cm-1 band, which is due to OH group in the lattice of sapphires, is stronger in blue sapphires than ln yellow ones. All evidence supports that the blue color of the sapphires from Mingxi is due to a H, Fe, Ti-containing defect cluster proposed by Moon et al.

关 键 词：蓝宝石 光谱 颜色 福建 明溪蓝宝石 

分 类 号：P578[天文地球—矿物学] P619.281[天文地球—地质学]