Abstract
The existence of microcavities (1–10 μm) in single crystalline nickel oxide was demonstrated by microscopic observations, and their effect on electrical conductivity described elsewhere. It was proposed that the anomalous conductivity values could be attributed to the presence, within the cavities, of oxygen gas under high pressure. In order to confirm this assumption, Raman microprobe and gas-phase chromatography experiments have been performed on NiO single crystals. The results obtained concerning the gases detected (oxygen and nitrogen) are in qualitative and quantitative agreement with the microscopic observations and the electrical conductivity measurements.
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