Abstract
Up to the present, fully or partially stabilized zirconia has been used as a solid electrolyte material in probes for the determination of oxygen in metallic melts. In the present study, the ionic conduction behavior of HfO2 (CaO) solid solutions and the compound calcium zirconate CaZrO2 have been investigated. Both polarization experiments and EMF measurements on oxygen concentration cells point out that these two highly refractory oxide materials are also most suitable solid electrolytes. Their use is particularly recommended for oxygen probe measurements in deoxidized steel melts where extremely high chemical stability and low partial electronic conductivity of the solid electrolyte is required. In the paper, properties such as crystal structure, free energy of formation, thermal expansivity, ionic and total electrical conductivity are summarized and compared for fully and partially stabilized ZrO2, calcium zirconate CaZrO3, HfO2 (CaO), and ThO2 (Y2O3) solid solutions.
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Janke, D. Oxygen probes based on calcia-doped hafnia or calcium zirconate for use in metallic melts. Metall Trans B 13, 227–235 (1982). https://doi.org/10.1007/BF02664579
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DOI: https://doi.org/10.1007/BF02664579