Abstract
Ionic transport number measurements have been made on single crystals of NiO over the temperature range 900–1300°C and for oxygen partial pressures varying from 10 −8 to 1 atm. At 1000°C and in air, t Ni ∼ 2 × 10 −7. The variation in cationic conductivity as a function of oxygen partial pressure suggests that V′ Ni is the dominant defect at high temperature and low oxygen pressure and that V″ Ni is the dominant defect at low temperature and high oxygen pressure.
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