多晶二硫化铁的热化学合成

THE SYNTHESIS OF POLYCRYSTALLINE IRON DISULFIED BY THERMOCHEMICAL REACTION

为了缩短元素Ｆｅ和Ｓ合成ＦｅＳ２的时间，直接采用ＦｅＳ和Ｓ经热化学反应合成ＦｅＳ２。将装有分析纯ＦｅＳ和Ｓ粉末的石英真空管放入两温区扩散炉中，在ＦｅＳ和Ｓ区域的温度分别为６５０℃和４００℃的情况下，经１３０ｈ的热化学反应，合成了淡黄色的多晶二硫化铁。经ＸＲＤ分析，合成物为黄铁矿结构。实验表明，Ｓ在ＦｅＳ中的扩散系数很小，为提高反应速度，ＦｅＳ宜以膜层形式暴露于Ｓ蒸汽中。

n order to reduce the synthetic time of pyrite from elements iron and sulphur,polycrystalline iron disulfied have been synthesized with FeS and S by thermochemical reaction. Quartz ampoule with FeS and S powder put in furnace with two temperature regions. When FeS reacts with S for 130 hours and the temperatures of FeS region and S region are 650℃ and 400℃ respectively, yellowish FeS2 is formed.The synthetic is in pyrite phase by XRD analysis.Experimental results show that diffusion coefficient of sulphur in FeS is small.Therefore for increasing the reaction speed FeS must be in powder layer exposing in sulphur vapor.