Structure and transport characteristics of single crystals of zirconia stabilized by scandia and co-doped with terbium oxide

The effect of doping with Tb2O3.5 on the phase composition, structure and transport characteristics of ZrO2 - Sc2O3 solid solutions has been studied. Single crystals of (ZrO2)1-x-y(Sc2O3)x(Tb2O3.5)y solid solutions, where (x = 0.08–0.10; y = 0.01–0.02), were grown by directional crystallization of t...

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Published in:Solid state ionics 2022-02, Vol.375, p.115836, Article 115836
Main Authors: Borik, M.A., Chislov, A.S., Korableva, G.M., Kulebyakin, A.V., Kuritsyna, I.E., Larina, N.A., Lomonova, E.E., Milovich, F.O., Myzina, V.A., Ryabochkina, P.A., Tabachkova, N.Yu
Format: Article
Language:English
Subjects:
Conductivity
Crystal structure
Crystallization
Directional melt crystallization
Electrical resistivity
Electron transfer
Ionic conductors
Phase composition
Raman spectroscopy
Scandium oxides
Single crystal
Single crystals
Skull melting
Solid electrolytes
Solid solutions
Transport properties
Zirconia
Zirconium dioxide
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Summary:The effect of doping with Tb2O3.5 on the phase composition, structure and transport characteristics of ZrO2 - Sc2O3 solid solutions has been studied. Single crystals of (ZrO2)1-x-y(Sc2O3)x(Tb2O3.5)y solid solutions, where (x = 0.08–0.10; y = 0.01–0.02), were grown by directional crystallization of the melt in a cold crucible. The phase composition and structure of crystals were studied by X-ray diffraction, Raman spectroscopy, optical and transmission electron microscopy. The electrical conductivity of single crystals was measured by impedance spectroscopy. It is shown that the stabilization of the pseudocubic t″-phase in crystals containing 8 mol% Sc2O3 observed at the addition of 2 mol% Tb2O3.5. The introduction of 1 mol% Tb2O3.5 into crystals containing 9 and 10 mol% Sc2O3 also leads to the formation of the t″ -phase. The conductivity of crystals with a pseudocubic t″ structure depends on both the total concentration of stabilizing oxides and the Tb2O3.5 content. The (ZrO2)0.9(Sc2O3)0.09(Tb2O3.5)0.01 single crystals had the maximum conductivity over the entire temperature range. •Phase composition, structure and transport properties of the (ZrO2)1-x-y(Sc2O3)x(Tb2O3.5)y crystals has been studied.•The crystals were grown by directional melt crystallization in the cold crucible.•The crystals contain both Tb3+ and Tb4+ ions.•The 8Sc2TbSZ, 9Sc1TbSZ, 9Sc2TbSZ, and 10Sc1TbSZ crystals are single-phase and have a pseudocubic structure (t″-phase).•The 9Sc1TbSZ crystals had the maximum specific conductivity, which was 0.20 S/cm at a temperature of 1173 K.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2021.115836