Surface structural analysis of polycrystalline wustite using STM and LEED

摘要

To understand the reduction mechanism of iron ores and their intermediate products is important in the iron making process. In the reduction process of wustite (Fe_(1-x)G), one of the intermediate products, Yamashita et al has reported from the in-situ observation using a high temperature optical microscope, that the reduction of Fe_(1-x)O on the surface consists of complicated mechanisms which depends on the partial pressure of CO and reaction temperature, They have considered that the elementary steps controlling the reaction near the surface, e.g. adsorption and diffusion, depend on each condition. To verify the elementary steps on the surface, the in-situ observation of the reduction on the Fe_(1-x)O surface is required in the smaller scale, preferably the nano order or the atomic level. Prior to the reduction reaction study in the nano level, the atomic arrangements and defects on the Fe_(1-x)O surface before the reduction need to be cleared.