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Ionic transport in zirconia-based single crystals

Name
Ekaterina
Surname
Stepanova
Scientific organization
ISSP RAS
Academic degree
bachelor
Position
engineer
Scientific discipline
Chemistry & Chemical technologies
Topic
Ionic transport in zirconia-based single crystals
Abstract
Materials based on zirconium dioxide have a number of unique physico-chemical, mechanical and electrical properties that determine their use in various fields, such as: medicine and technology. Solid electrolyte based on partially stabilized zirconia (PSZ) or completely stabilized zirconia (SZ) are the most popular and studied for practical use (in particular, in the solid oxide fuel cell) today. The main feature of these materials is the presence of exclusively anionic conductivity, which determines their use in SOFCs as an electrolyte membrane.
Keywords
ionic transport, ion conductors, zirconia-doped monocrystals, zirconia-based monocrystals, partly-stabilized zirconia
Summary

The main purpose of this work is to study transport properties of single crystals based on zirconium dioxide and it's dependence on the concentration of the stabilizer. For convenience, researches are carried out on single crystals, as ceramics have  the grain boundaries, which, in turn, have characteristics distinguish from the bulk, as well as it have an affect on the measurment stability. Thus, the results of measurements of physical characteristics such as electrical conductivity, are related only to the volume of material and eliminate the influence of the grain boundaries, which significantly facilitate selection of composition and help evaluate the quality of products made of ceramic materials used in SOFC.

In this work conductivity of monocrystals of partially stabilized zirconia (PSZ) Zr (1-x-y) Sc (y) Y (x) O (2-z) is measured by impedance spectroscopy.The temperature dependence of bulk conductivities is constructed. The influence of overall concentration of dopants and the concentration of Y2O3 and Sc2O3 separately on the conductivity of single crystal is determin.