Investigation of the Iron-Sulfide Phase Transformation in Nanoscale
Investigation of the Iron-Sulfide Phase Transformation in Nanoscale
复制标题
纳米尺度铁硫化物相变的研究
DOI：
10.1021/cg500333p
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发表时间：
2014-09-01
影响因子：
3.8
通讯作者：
Zhao, Hui
中科院分区：
文献类型：
--
作者：
Bai, Pengpeng;Zheng, Shuqi;Zhao, Hui
铁硫化物是一种多晶型物质，在地质学、海洋系统、材料科学和生命科学中起着重要作用。铁硫化合物的晶体结构和相变是复杂和难以捉摸的。在本研究中，我们制备了大多数已知的铁硫化物，mackinawite是第一个反应产物，逐渐下降，直到它消失，随后立方FeS和硫铁矿呈现层状生长的特点。利用高分辨透射电子显微镜，我们首次直接观察到立方FeS向云英岩的转变和mackinawite向云英岩的转变。在无氧H2S环境中极不稳定的钙铝榴石被发现在向更稳定相的过渡中起中间作用。
Iron sulfides, polymorphous substances, play a key role in geology, marine systems, material science, and the life sciences. The crystal structures and phase transitions of iron sulfur compounds are complex and elusive. In this study, we fabricated most known iron sulfides, mackinawite was the first reaction product, which declined gradually until it disappeared; the following Cubic FeS and troilite presented a characteristic of layer growth. Using high-resolution transmission electron microscopy, we directly observed for the first time the transition of cubic FeS into greigite and that of mackinawite into greigite. Greigite, which is extremely unstable in an oxygen-free H2S environment, was found to play an intermediate role in the transition into a more stable phase.