engleski

Oxidation of Cobalt by Oxygen Bombardment at Room Temperature

Most experiments on thermal oxidation of cobalt have shown the parabolic growth rate consistent with diffusion of cations through neutral cation vacancies. Here, we present experimental results on the oxidation of Co metal by low- energy oxygen bombardment at room temperature, which scales with the dose of implanted oxygen as 1/6. This type of oxide growth is predicted theoretically for diffusion of cobalt cations by doubly charged cation vacancies. Our results demonstrate that oxidation, which involves formation of both monoxide, CoO, and spinel, Co3O4, oxide structures, can be indeed driven by charged vacancies, as predicted theoretically, when oxidation conditions enhance both the production of point defects and mobilities of cobalt cations and oxygen anions within cobalt oxide.

Cobalt oxide ; XPS ; Ion-bombardment ; Low-temperature oxidation ; Cation vacancies

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