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Initial oxidation process of zirconium was examined under an oxygen pressure of $1 \times 10^{-7}$ torr and in a temperature region from 400 to 500$^circ$C by measuring the contact potential differenc...e of zirconium with respect to gold, in which surface oxygen concentration was monitored with Auger electron spectroscopy. The contact potential difference of zirconium with respect to gold was negative: Its absolute value initially increased on oxidation and then decreased through the minimum value after the surface oxygen concentration exceeded the solubility limit in zirconium. When the oxygen supply was stopped, the contact potential difference changed with time due to the inward diffusion of oxygen. The diffusion coefficient of oxygen was evaluated from the change of surface oxygen concentration with time at 400$^circ$C and 500$^circ$C. The obtained diffusion coefficients were in agreement with the values reported by previous investigators.続きを見る
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Mendeley出力
