电子束辐照对黄铁矿表面组成的影响

Effect of Electron Beam Irradiation on Composition of Pyrite Surface

利用X射线光电子能谱(XPS)和X射线衍射(XRD)对高能电子束辐照前后晶体黄铁矿的表面结构进行了分析。结果表明,辐照处理没有改变黄铁矿晶胞的形状和大小,但对晶胞中原子坐标位置可能有一定调整,在空气中辐照使黄铁矿表面硫/铁原子数比减小,而在液相辐照则使黄铁矿表面硫/铁原子数比增加。并对电子束辐照条件下黄铁矿表面反应机理进行了分析。

The structures and compositions of pyrite surface before and after high energy electron beam irradiation were investigated by applying X ray photoelectron spectroscope （XPS） and X ray diffraction （XRD）. The results show that irradiation does not change the shape and size of crystal cells of pyrite but may regulate the relative coordinate position of atoms in crystal cells. Irradiation in atmosphere can decrease the sulfur/ferrum atom ratio on pyrite surface and that in liquid may, on the contrary, increase the ratio. The reaction mechanism of pyrite surface under the irradiation of electron beam is analyzed.