紫方钠石——一种光致变色的天然矿物材料  

SODALITE-A NATURAL TENEBRESCENCE MINERAL MATERIAL

作　　者：廖尚宜[1] 彭明生[1] 蒙宇飞[1] 

机构地区：[1]中山大学地球科学学系,广东广州510275

出　　处：《矿物岩石》2005年第3期75-78,共4页Mineralogy and Petrology

摘　　要：针对新产地的紫方钠石利用电子探针能谱、X射线粉末衍射、傅立叶红外光谱和电子顺磁共振谱进行初步的研究,发现其颜色随成分中S及C l的质量分数比例而变化;晶体中含水,其中3 438 cm-1和1 623 cm-1分别为结晶水的伸缩振动锋和弯曲振动锋;由电子顺磁共振谱测得其ΔH=45.6 G,g因子为2.027±,表明其结构中存在S22-离子与卤素空位有关,因此变色效应是由于色心所引起。研究还表明该矿床的紫色方钠石是很好的光致变色材料。Experiments were conducted by using SEM-EDS,EPMA,XRD,FTIR and EPR to analyze some new Afghanis hackmanite samples. Chemical analyses revealed that the mineral contains certain amount of sulfur as a substitute for chlorine in the crystal structure. The FTIR spectra of hackmanite showed that the samples contain water. The stretching vibration peak of water of crystallization （H2O） occurs at 3 438cm^-1 and the bending peak is at 1 623cm^-1. EPR spectra measurement is △H=45.6 G; g factor=2. 027±. Its tenebrescent is caused by ＂hole colour centres＂which are contributed to the presence of sulfur （S2^2-） and to some negatively charged chlorine atoms being missing in the crystal structure of hackmanite. Therefore, Afghanis hackmanite is an excellent natural tenebrescent material.

关 键 词：紫方钠石 变色效应 色心 

分 类 号：P578.973[天文地球—矿物学]