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Defects on transition metal oxide surfaces
Abstract
In the solid state, transition metal cations can often exist in any one of several oxidation states. Cobalt and manganese are two transition metals which share this ability. Because of this, it is often difficult to obtain data on a solitary and well-defined transition metal oxide surface phase. Under certain oxidizing UHV conditions, however, it is possible to produce, isolate and characterize several structurally and electronically different transition metal oxide species. The creation of stoichiometric surfaces of CoO(100) and MnO(100) single crystals is documented by data by AES, LEED, XPS, and HREEL spectroscopies. The stoichiometric single crystals were then exposed to oxidizing conditions to encourage the growth of higher oxide thin films. Because of the similarity in lattice structure of the rock-salt metal monoxide (100) orientation and the spinel structure (100) orientation it is possible to grow the higher oxide films epitaxially on top of the metal monoxide substrates. The procedure for growing epitaxial thin films of $\rm Co\sb3O\sb4,\ Mn\sb2O\sb3$ and $\rm Mn\sb3O\sb4$ on the CoO(100) and MnO(100) surfaces will be described, and XPS, and HREEL data supporting the growth of the epitaxial thin film, $\rm Co\sb3O\sb4$, will be presented. Calculations that were used to determine the thickness of the thin $\rm Co\sb3O\sb4$ overlayer will also be presented along with a discussion of the mechanics of the thin film growth.
Subject Area
Chemistry|Chemistry|Condensation
Recommended Citation
Carson, Gregory A, "Defects on transition metal oxide surfaces" (1997). ETD collection for University of Nebraska-Lincoln. AAI9736924.
https://digitalcommons.unl.edu/dissertations/AAI9736924