Preparation, crystal structure, and electrical conductivity of the solid electrolyte Zr0.86Sc0.12Y0.02O1.93

• Published in: Inorganic materials Vol. 47; no. 8; pp. 888 - 894
• Main Authors: Zyryanov, V. V., Uvarov, N. F., Ulikhin, A. S.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-08-2011
• Subjects: Ceramic powders; Ceramics; Chemistry; Chemistry and Materials Science; Density; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science; Nanomaterials; Nanostructure; Resistivity; Sintering (powder metallurgy); Solid electrolytes; Solid Electrolyte; Solid Oxide Fuel Cell; Reaction Sinter; Solid State Ionic; Mechanochemical Synthesis
• DOI: 10.1134/S002016851108022X
• EISSN: 1608-3172
• ISSN: 0020-1685

The solid electrolyte Zr
0.88
Sc
0.12
Y
0.02
O
1.93
for reduced-temperature SOFCs has been characterized by Rietveld X-ray powder diffraction analysis and conductivity measurements in the temperature range 295–970 K. Gas-tight nanostructured ceramic composites consisting of cubic, rhombohedral, and monoclinic phases have been produced by reaction sintering of mechanochemically prepared powders. The oxygen ion conductivity of the ceramic prepared by sintering at 1630 K, with a relative density of 94%, is three times lower than that of ceramics fabricated from DKKK Zr
0.89
Sc
0.1
Ce
0.01
O
1.95
powder, but raising the sintering temperature to 1670 K increases the density of the ceramic to 99%, and its conductivity reaches the level of the DKKK ceramics. The core-shell ceramic nanocomposite obtained in this study possesses high mechanical strength and a reduced activation energy for grain-boundary conduction.