Abstract
The charge transport of boron carbide, often incorrectly denoted asB4C, has been controversially discussed. It is shown that the bipolaron hypothesis is notcompatible with numerous experimental results. In particular, the determined realmicrostructure of boron carbide and its related electronic properties disprove severalassumptions, which are fundamental to the bipolaron hypothesis. In contrast, the actualenergy band scheme derived mainly from optical investigations is confirmed by carefulevaluation of the high-temperature electrical conductivity, and allows a consistentdescription at most of the experimental results.
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