The oxidation of cobalt in air from room temperature to 467°C |
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Authors: | H G Tompkins J A Augis |
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Affiliation: | (1) Bell Telephone Laboratories, Inc., 43213 Columbus, Ohio |
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Abstract: | The oxidation of cobalt in air is investigated for times ranging over three orders of magnitude up to 1000 hr and for temperatures ranging from room temperature up to 467°C. Three different growth processes are observed. When a clean surface is exposed to air at room temperature, an 8–10 Åfilm of Co(OH)
2
forms in seconds or less. For temperatures of 50–100°C, very little additional film forms for times up to 1000 hr. For temperatures of 100–225°C, a film of CoO grows in a manner which can be described empirically with a fourth root rate law with an activated rate constant. Between 225 and 325°C there is a transition to a quadratic rate law. At 425°C the film appears to be a mixture of CoO and Co
3O4. |
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Keywords: | Oxidation kinetics Auger electron spectroscopy quartz crystal oscillation thin film |
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