Browsing by Author "Ritchie, I M"

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    Effect of Pressure Changes on the Oxidation Rate of Aluminium in the Temperature Range 323-673 K.
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (8), 1972) Hunt, G L; Ritchie, I M
    This paper describes sonic experiments on the oxidation of evaporated aluminium films in the temperature range 323-673 K. The kinetics were followed by measuring the rate of increase in resistance as the film was consumed by oxidation. The effect of suddenly altering the oxygen pressure on the oxidation rate was studied as a function of time and oxidation temperature. In the pressure range studied (ca. 1 x 103-30 x 103 N m~2 of oxygen), pressure increases were always associated with rate increases and pressure decreases with rate decreases. The effect of the pressure change on the reaction speed was found to diminish somewhat as the oxidation progressed, and also decreased with temperature. These results have been interpreted in terms of a modified Mott-Cabrera theory.
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    Oxidation of Aluminium by Nitrous Oxide in the Temperature Range 323-683 K
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (8), 1972) Hunt, G L; Ritchie, I M
    This paper describes experiments on the oxidation of evaporated aluminium films by nitrous oxide in the temperature range 323-683 K. The kinetics of the reaction were followed by measuring the rate of increase in resistance of the film as it was consumed by oxidation. Experiments in which an electric field was applied across the growing oxide layer were carried out. The pressure dependence of the reaction was studied by investigating the change in oxidation rate accompanying an abrupt pressure change. The results of all these experiments indicate that the aluminium/nitrous oxide system is very complex, and no single rate determining step is operative over the whole temperature range. Four different regions of growth were identified, and possible reaction mechanisms are considered