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The diffusivity of oxygen in liquid lead by electrochemical measurements

  • Physical Chemistry
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Abstract

The oxygen diffusivity in liquid lead in the temperature range of 880 to 1135°C was determined using the following electrochemical cell with linear geometry:

$$Ni - NiO|ZrO_2 ( + CaO)|\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{O} in Liquid Pb|ZrO_2 ( + CaO)|FeO - Fe_3 O_4 $$

The unsteady diffusion of oxygen in liquid lead was caused by applying a preselected voltage between the FeO−Fe3O4 and liquid lead electrodes. The oxygen diffusivity in liquid lead was calculated from the change of the electromotive force with time between the Ni−NiO and liquid lead electrodes.

The experimental results forD 0 were in close agreement with those of Szwarcet al. whose values were larger by one order of magnitude than those of the other investigators. The results of our experiments give the relation:

$$D_0 = 14.8(_{ - 4.4}^{ + 6.2} ) \times 10^{ - 4} \exp (\tfrac{{ - 4660 \pm 2560}}{{RT}})cm^2 /s$$

.

Based on the present data and the reliable data for some other liquid metals, the ratio of the oxygen diffusivity to the self-diffusivity of the solvent was found to be correlated with the standard free energy change for dissolution of oxygen in the liquid metal.

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Authors and Affiliations

  1. Department of Metallurgy, Faculty of Engineering, Osaka University, Osaka, Japan

    Shinya Otsuka (Research Associate) & Zensaku Kozuka (Professor)

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  1. Shinya Otsuka
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  2. Zensaku Kozuka
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Otsuka, S., Kozuka, Z. The diffusivity of oxygen in liquid lead by electrochemical measurements. Metall Trans B 6, 389–394 (1975). https://doi.org/10.1007/BF02913822

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  • DOI: https://doi.org/10.1007/BF02913822

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