福建明溪蓝宝石矿物学特征及致色机理探讨

Research on Mineralogical Characteristics and Color-causing Mechanism of Sapphires from Mingxi, Fujian

利用颜色测量、顺磁共振谱、红外光谱和热谱等方法研究明溪蓝宝石的矿物学特征和结构特性。明溪蓝宝石色深 ,蓝中带黄 ,二色性强。分析表明Fe主要以Fe3+形式存在 ,Fe3+的d_d电子跃迁和Fe2 +-Ti4 +、O -Fe间电荷转移是明溪蓝宝石致色的主要因素 ;H含量对蓝色的形成有重要作用。

Sapphires from Mingxi were investigated by such means as chromatic measurement, EPR, IR and TGA-DTA. It has a dark color mixed with yellow color and strong dichroism. The spectra obtained show that Fe 3+ is the main form of the Fe atoms, d-d leap of Fe 3+ and charge transfer are the main factors causing the formation of colors. The content of H is an important factor in the formation of blue color.