Impedance spectroscopy investigation on the low-temperature degradation of tetragonal zirconia: influence of measurement conditions

摘要

Impedance s pectroscopy has been used for the characterization the low-temperature degradation of yttria-stabilized tetragonal zirconia polycrystals in a non-destructive assay. Superficial transformation resulting from annealing in air lead to the appearance of an extra relaxation in the imedance spectra which evolves with degradation extent. It has been demonstrated that in situ electrical characterization cnannot be performed because the electrode layers retard the degradation phenomenon. The ideal temperature/time condition to record spectra is also discussed.