低铁闪锌矿(含Fe量在1%以下)在阴极射线下的发光现象,是众所周知的.然而,它所存在的光电导现象及对电子探针分析值的影响,却往往被人们所忽视.实际上,低铁天然闪锌矿是一种半导体光电物质,其电阻率随入射光强度的变化而变化.当电子探针分析未喷镀导电膜的低铁闪锌矿时,其光电导现象很明显,对元素的特征X射线强度值影响较大,从而使分析结果产生很大误差.实验在加速电压为30KV时,当改变 It is well-known that luminescence of low-iron-type sphalerite (containing less than 1% Fe) under cathodal rays, however, the photoconductivity that exists in it and its effect on the electron probe analysis are often affected by the In fact, the low-iron natural sphalerite is a semiconductor optoelectronic material whose resistivity varies with the intensity of the incident light.When the electron probe is used to analyze the low-iron sphalerite not sprayed on the conductive film, the photoelectric It is obvious that the lead phenomenon has a great influence on the characteristic X-ray intensity value of the element, so that the analysis result has a great error. When the acceleration voltage is 30KV,