Abstract
The conductivity-temperature characteristics of anatase was found to have hystereses, and these behaviours were explained by the two kinds of chemisorbed oxygen ions, one of them predominates at the temperature below 300°C and the other is present at 700°C. The conductivity-oxygen partial pressure characteristics of anatase was also measured, and the results showed two kinds of dependence of σ on PO2 i.e. in the range of PO2 above 0.3Pa, σ increased with decreasing PO2, and below 0.3Pa, σ was independent of the decrease in PO2. The above dependence in high PO2 region was affected by the microstructure. The results of isotopic exchange showed two kinds of oxygen releases. These results were able to be explained by the presence of the chemisorbed oxygen.
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