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- W4233046543 abstract "Studies of the oxidation of high‐purity iron samples at 224°, 285°, and 350°C have been conducted in an oxygen partial pressure of Torr for exposure times ranging from 25 to 2000 sec. The oxide films were measured and quantitatively analyzed for trace carbon impurities using proton‐impact‐excited characteristic x‐rays. Analytical surface sensitivities to the equivalent of 10−3 monatomic layers have allowed direct studies of ultrathin (<50Aå) oxide film kinetics. A two‐stage logarithmic oxidation rate law was observed at all temperatures with the transition from the first to second stage occurring at oxide thicknesses of 25, 36, and 52Aå at 224°, 285°, and 350°C, respectively. This observation is discussed in terms of Uhlig's theory for logarithmic oxidation. Quantitative measurements of carbon impurities on the iron surfaces show that an increase in the preoxidation surface coverage from 0.1 to 1.0 monolayer results in a significant suppression of the oxidation process. Detailed studies were made of the removal of residual carbon and oxygen impurities and 12–14Aå air‐formed oxide films from the iron surface by vacuum annealing at 715°C. Without H2 reduction techniques, preoxidation iron surface coverages of 0.4 monolayer oxygen and one monolayer carbon were routinely obtained. Also, the residual surface carbon, present prior to oxidation, does not oxidize off of the surface during the oxidation process at these temperatures." @default.
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- W4233046543 date "1973-01-01" @default.
- W4233046543 modified "2023-09-30" @default.
- W4233046543 title "The Kinetics of Thin Oxide Film Formation on Iron Using Proton-Impact-Excited X-Ray Analysis" @default.
- W4233046543 doi "https://doi.org/10.1149/1.2403562" @default.
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