Abstract
Crystals of hexagonal selenium have been grown in a melt. Their microstructures have been compared with those arising in vapor crystals. The dark resistivity has been studied as a function of axis orientation, temperature, field, and time of application of a field. The thermoelectric power has been measured and attempts made to measure Hall effect. The nature of the acceptor levels has been discussed, the approximate hole densities and mobilities have been determined, and values of the activation energies obtained. The field effects have been discussed and the phenomenon of an apparent semipermanent polarization occurring at quite low fields has been noted.
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