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Structural investigation of iron sulfides synthesized by mechanochemical reaction

机译：机械化学反应合成硫化铁的结构研究

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In the current study, pure elemental powders of Fe and S were mixed to give the desired compositions of Fe_(67)S_(33), Fe_(50)S_(50) and Fe_(33)S_(67). A SPEX 8000D high-energy ball mill was used to synthesize iron sulfide powders under an Ar-filled atmosphere. The as-milled powders were examined by conventional X-ray diffraction (XRD) and synchrotron X-ray absorption spectroscopy (XAS). The experimental results showed that mechanochemical reactions occurred during the ball milling process for all the compositions investigated. The Fe_(1-x)S phase was observed at the end of milling. The formation time of the Fe_(1-x)S phase increased with increasing sulfur content. Extended X-ray absorption fine structure (EXAFS) results revealed that the nearest neighbor bond lengths of the radial distribution function for iron decreased when iron sulfides formed. X-ray absorption near-edge structure (XANES) of sulfar K-edges distinguished better the structural evolution of these iron sulfides.
机译：在当前的研究中，将纯净的Fe和S元素粉末混合，得到所需的Fe_（67）S_（33），Fe_（50）S_（50）和Fe_（33）S_（67）组成。使用SPEX 8000D高能球磨机在充满Ar的气氛下合成硫化铁粉末。通过常规X射线衍射（XRD）和同步加速器X射线吸收光谱法（XAS）检查研磨后的粉末。实验结果表明，在所研究的所有组合物的球磨过程中均发生了机械化学反应。在研磨结束时观察到Fe_（1-x）S相。 Fe_（1-x）S相的形成时间随着硫含量的增加而增加。扩展的X射线吸收精细结构（EXAFS）结果表明，当形成硫化铁时，铁的径向分布函数的最近邻键长度减小。硫磺K边缘的X射线吸收近边缘结构（XANES）更好地区分了这些硫化铁的结构演变。

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