Abstract
The nature of the optical absorption gap in NiO at 4.0 eV is investigated. It is found that this gap is due to a band to band transition, where an electron is taken out of the valence band and placed into the conduction band. The optical gap of 6.0 eV found in Ni∶MgO is of a nature, where an electron is taken out of the oxygen 2p band and placed into the first affinity level of the Ni2+ ion (3d 8L»3d 9L−1). The impurity band created in Ni1−x Li x O by the Li ions is found 2.3 eV below the bottom of the conduction band in agreement with model predictions.
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Hüfner, S., Steiner, P., Sander, I. et al. The optical gap of NiO. Z. Physik B - Condensed Matter 86, 207–215 (1992). https://doi.org/10.1007/BF01313827
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DOI: https://doi.org/10.1007/BF01313827