Abstract
The variation of conductivity of cadmium oxide with temperature has been measured over the temperature range 100°-800°K. It is found that the varitions observed in the specimens used can be accurately predicted if it is assumed that all the electrons which are effective in the conduction process have energies above the bottom of the conduction band exceeding the characteristic energy of the lattice hν. This appears to be the first test of the mean free path theory for such electrons in ionic lattices. The properties of these electrons are markedly different from those with energies less than hν which are usually met with in semiconductors.
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