Abstract
In an earlier study, Hall-effect and conductivity measurements made on semi-insulating GaAs were examined by a new approach to mixed conduction analysis. The analysis of 400-K measurements was based on the assumption of a fixed electron-to-hole mobility ratio. The effect of uncertainty in this ratio is examined in the present communication, and the nomographic presentation is simplified. The conductivity criterion for the onset of mixed conduction is revised and the quartic used earlier for comparative analysis is corrected.
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