采用 FeSO4和(NH2)2CS 的混合物为前驱物, 在聚乙烯吡咯烷酮(PVP)作保护剂的醇-水体系中, 经不同温度和时间的溶剂热反应, 在酸性条件和碱性环境下均获得晶粒完整的 pyrite 粉体. 借助 X 射线衍射(XRD)、透射电子显微镜(TEM)及紫外-可见分光光度计对酸性条件下合成样品的晶相组成、粒度、形貌及光学性能进行分析与表征, 并运用 Rietveld 法对 X 射线衍射谱进行了结构精修,研究结果表明: 当温度为 200℃时, 反应 36h, 能制得体相结构完整、缺陷少、高分散的 pyrite 纳米晶. A mixture of FeSO4 and (NH2) 2CS was used as a precursor in the alcohol-water system with polyvinylpyrrolidone (PVP) as the protective agent. The solvothermal reaction was carried out under both acidic and alkaline conditions at different temperatures and times Grain-finished pyrite powder.The crystalline phase, particle size, morphology and optical properties of the synthesized samples were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-visible spectrophotometer The results show that pyrite nanocrystals with complete structure, less defects and high dispersion can be prepared when the reaction temperature is 200 ℃ for 36 hours.