Infrared spectrum of microcrystalline zinc oxide. Electronic and vibrational contributions under different temperature and environmental conditions
Abstract
The infrared spectrum (700–4000 cm–1) of quasi-stoichiometric microcrystalline ZnO has been recorded at various temperatures (97–523 K) and following various redox treatments.
A broad band centred at ca. 1500 cm–1, produced on samples cooled down to 97 K in oxygen, is ascribed to the increasing concentration of un-ionized donor centres.
The disappearance of all phonon and surface impurity (OH, carbonate-like species) bands, caused by heating the samples to 433 K both in vacuo and in a hydrogen atmosphere, is ascribed to the phonon–plasmon coupling in microcrystals possessing a rather high concentration of electrons in the conduction band.
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