Abstract
Abstract The reduced state of the surface of titanium dioxide was studied by the measurement of the heat of immersion in water. When the titanium dioxide was reduced by hydrogen at 500°C, the heat value decreased appreciably with an increase in the pressure of hydrogen, in contrast to the increase in the heat value due to the reduction by an organic contaminant. The heat value was not restored to the original state even after oxygen had been introduced at 500°C to the reduced sample, while the color of the sample returned to white from bluish gray. These phenomena were interpreted by examining the adsorption of water, the reduced amount, and the reflectance spectrum.
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