The electrical conductivity of cuprous oxide is studied from room temperature to 700�C. It is observed that whereas the conductivity may be represented by the formula ?=Ae-?/kT at the higher temperatures, below 300�C the exponential law is not obeyed. The maxima and minima of the conductivity curves observed in the latter region are presumed to result from a combination of a saturation of clusters and a rapid decrease of mobility with temperature. Hall effect measurements up to 450�C show that the number of current carriers does not obey the exponential law of temperature dependence. An anomaly in the mobility is observed around 150�C where the mobility changes from a T-5 to a T-7 dependence.
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