超单元
覆盖层
材料科学
磁性结构
衍射
结晶学
凝聚态物理
化学
物理
磁化
磁场
光学
量子力学
雷雨
气象学
作者
Courtney H. Lanier,Ann N. Chiaramonti,Laurence D. Marks,Kenneth R. Poeppelmeier
出处
期刊:Surface Science
[Elsevier]
日期:2009-08-01
卷期号:603 (16): 2574-2579
被引量:46
标识
DOI:10.1016/j.susc.2009.06.006
摘要
The so-called Biphase termination on α-Fe2O3 has been widely accepted to be a structure with a ∼40 Å unit supercell composed of coexisting islands of Fe1−xO and α-Fe2O3. Based on thermodynamic arguments and experimental evidence, including transmission electron diffraction, imaging, magnetic and spectroscopic information, it is found that the previously proposed structure model is inaccurate. The actual Biphase structure is instead a layered structure related to the reduction of α-Fe2O3 to Fe3O4. A model for the Biphase termination is proposed which does not contain islands of Fe1−xO but instead consists of bulk α-Fe2O3 and a Fe3O4-derived overlayer. The proposed model is consistent with all current and previously reported experimental findings.
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