湖北秦古绿松石的红外吸收光谱特征

IR Absorption Spectrum Representation of Qingu Turquoise in Hubei Province

为了研究新近发现的并极具开采潜力的湖北省竹山县秦古地区绿松石的特点,采用傅里叶变换红外光谱仪(Nicolet550型)对湖北秦古地区绿松石的红外吸收光谱进行测试,分析出OH-,H2O及PO43-集团的振动模式和频率决定了绿松石红外光谱的主要特征,且不同产地、不同结晶类型的绿松石的红外吸收光谱差异较小,说明秦古绿松石的分子组成和其它优质产地的绿松石相同。而且,通过从室温至400℃的变温红外光谱测试,发现红外吸收光谱发生明显变化,绿松石中的水发生脱失,其颜色发生变化,说明水对绿松石的颜色有一定影响,因此优质绿松石的水含量要适当。

The infrared absorption spectrum of Qingu turquoise samples from Hubei Province are tested by the Fourier transformation infrared spectroscope （Nicolet 550）. The results show that the vibration mode and frequency of OH-, H20 and PO43 have decided the infrared spectrum＇s chief feature of turquoise samples. And the infrared absorption spectrum of the different habitat and the different crystallization type turquoise have little difference. Moreover, the infrared absorption spectrum has the obvious change, through the infrared spectrum test from the room temperature to the 400℃. The water in the turquoise loses and its color changes. It means water has certain influence to the turquoise＇s color.