Abstract
The present work aimed to study a family of solid ceramic electrolytes based on magnesium oxide doped zirconium oxide, usually identified as Mg-PSZ (zirconia partially stabilized with magnesia), used in the manufacture of oxygen sensors for molten metals. A set of electrolytes was prepared by mechanical (milling) and thermal (sintering) processing, varying the composition in magnesia and the cooling rate from the sintering temperature. These two parameters are essential in terms of phase composition and microstructure of Mg-PSZ, determining the behavior of these materials. The structural and microstructural characterization was done by means of X-ray diffraction (XRD). The electrical properties were analyzed by impedance spectroscopy in air. In general, the results obtained from various concentrations of dopant, different cooling rates and the same sintering step condition showed an increased conductivity for samples with predominance of high temperature stable phases (tetragonal and cubic).
Highlights
The development of solid electrolytes based on materials such as zirconium oxide has aroused interest due to its high ionic conductivity over wide temperature ranges and partial pressure of oxygen
The solid electrolyte must comply with a series of requirements, such as high densification (˃ 92% of the theoretical in order to prevent the passage of gases through the interior of the electrolyte), purely ionic conductivity and great resistance to thermal shock
In addition to the constraints associated with an X-ray diffraction (XRD) analysis of a sintered sample, in this case, there is an overlap between the main peaks of the tetragonal and cubic phases
Summary
The development of solid electrolytes based on materials such as zirconium oxide has aroused interest due to its high ionic conductivity over wide temperature ranges and partial pressure of oxygen. Among the most important applications of these materials, we highlight the oxygen sensors for molten metal For this application, the solid electrolyte must comply with a series of requirements, such as high densification (˃ 92% of the theoretical in order to prevent the passage of gases through the interior of the electrolyte), purely ionic conductivity and great resistance to thermal shock. The solid electrolyte must comply with a series of requirements, such as high densification (˃ 92% of the theoretical in order to prevent the passage of gases through the interior of the electrolyte), purely ionic conductivity and great resistance to thermal shock These properties are strongly dependent on the phased composition and microstructure, both conditioned by the chemical composition and thermal path (Grzebielucka et al 2010).
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