Abstract
Abstract The rate of increase in conductivity of zinc oxide caused by hydrogen was found to be proportional to p0.85 and to have an activation energy of 21 kcal./mol. For this system the activation energy of the increase of donors was shown to be almost the same as that of the conductivity increase. The activation energy of the decrease of donors by evacuation was 31 kcal./mol. A similar conductivity increase was observed with carbon monoxide. On the basis of these results together with those of adsorption measurements reported previously, it was concluded that the conductivity increase was scarcely related at all to the hydrogen chemisorption, indicating that it is untenable to postulate two such types of hydrogen chemisorption as was believed in the previous work, i.e., one responsible for the conductivity increase and the other without such effect. As for the cause of the conductivity increase, the surface reduction of zinc oxide was suggested.
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