Abstract
Electrical conductivity measurements over the temperature range 400 to 1000° C have been made on specimens in the Sc2O3-ZrO2-Al2O3 system as functions of Sc2O3 and Al2O3 contents. Both 4-probe d.c. conductivity and complex impedance dispersion analysis techniques were used. Samples which contained monoclinic ZrO2 showed jumps and hysteresis effects, although these effects were considerably masked in alumina-rich samples. Conductivity results indicate that, in samples which contained relatively small amounts of Al2O3 (2 to 5 wt%) or were free from Al2O3, a significant proportion of the monoclinic ZrO2 was present in series with the conduction paths of the oxygen ion vacancies. In Al2O3-rich samples the major proportion of monoclinic ZrO2 appears to be preferentially distributed at locations in the microstructure where it had less influence on the conductivity. For samples which did not show jumps or hysteresis effects the Arrhenius plots had lower slopes at higher temperatures.
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Badwal, S.P.S. Effect of alumina and monoclinic zirconia on the electrical conductivity of Sc2O3-ZrO2 compositions. J Mater Sci 18, 3230–3242 (1983). https://doi.org/10.1007/BF00544147
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DOI: https://doi.org/10.1007/BF00544147