Abstract
Samples of zirconia containing 0, 8 and 15 mol % calcia were sintered in very low partial pressure of oxygen (∼ 10−6 Pa) and the resulting phases, lattice parameters and electrical conductivity studied. The cubic phase was found to be partially stabilized in the calcia-free samples while complete stabilization occurred in the samples containing 8 and 15 mol calcia. The lattice parameter of the cubic phase showed dependence on the calcia content and the concentration of vacancies at the anion sites. The concentration of these vacancies in the calcia-containing samples is estimated to be 21 % and is limited by the appearance of metallic zirconium located in isolated pockets. Electrical conductivity measurements also indicated that the metallic phase was not continually connected. A peak and a minimum in the conductivity-temperature plot are believed to be due to the removal of excess oxygen vacancies introduced during sintering.
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Ramaswamy, P., Agrawal, D.C. Effect of sintering zirconia with calcia in very low partial pressure of oxygen. J Mater Sci 22, 1243–1248 (1987). https://doi.org/10.1007/BF01233116
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DOI: https://doi.org/10.1007/BF01233116