Abstract
The conductivity of several single crystal and polycrystalline Y2O3-ZrO2 samples has been studied by complex impedance and four-probe direct current techniques. For single crystals only one arc, due to lattice conductivity, was observed in the complex impedance representation. Polycrystalline materials showed a second arc, due to grain boundary resistance, the extent of which decreased as the impurity concentration was reduced and as the electrolyte microstructure improved. The activation energies for the volume and total conductivity of the purest polycrystalline samples were similar and agreed with those for the single crystals. These values, however, decreased by 20 to 25 kJ mol−1 on going from low (<550° C) to high (>850° C) temperatures. The change in the activation energy with temperature is thought to be due to a gradual transition between an association region, where vacancies are bound to dopant cations, and a dissociation region where vacancies are free and mobile.
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Badwal, S.P.S. Electrical conductivity of single crystal and polycrystalline yttria-stabilized zirconia. J Mater Sci 19, 1767–1776 (1984). https://doi.org/10.1007/BF00550246
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DOI: https://doi.org/10.1007/BF00550246