The drift mobility of excess holes has been investigated in undoped NiO crystals using a transient technique with electron-beam excitation. Specimens with low-impurity content were grown epitaxially from the gas phase. At room temperature μₕ lies between 20 and 50 cm² V^-1 sec^-1, and its temperature dependence shows that scattering by optical modes predominates. The results lead to a phonon energy of 0.055 eV, a polaron effective mass of 1.5m₀, and a coupling constant of 1.6.
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Spear et al. (1973) studied this question.
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