Abstract
Influence of intrinsic electron traps on the electrical conductivity of thermochemically reduced yttria-stabilized zirconia has been studied. The defect structure of the reduced samples was characterized using optical absorption and EPR techniques. Electrical conductivity of samples containing T and C-defects have been measured by impedance spectroscopy between 500 and 1000 K.A thermally activated electronic conduction at low temperatures two orders of magnitude higher than the ionic conduction has been associated with the presence of C-traps. Evidence is given for the existence of a defect band at ≈ 1.3 eV below the conduction band. An energy level diagram comprising this band and the energy levels of T- and C-traps is proposed to explain the electronic conduction behaviour of reduced zirconia.
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