Journal of the American Ceramic Society · 2005 · 593 citations · 29 references
Materials ScienceMaterials EngineeringMagnetic PropertiesEnhanced SinteringSinteringEngineeringSolid-state IonicOxide ElectronicsTransport PropertiesApplied PhysicsDoped Barium ZirconateCeramics MaterialsCeramic SynthesisZinc OxideTransition MetalChemistryCeramic PowdersFunctional Materials
Conductivity was measured by AC impedance spectroscopy. Adding ZnO to BaZr0.85Y0.15O3‑δ yields >93 % theoretical density at 1300 °C, Zn enrichment at grain boundaries, excellent chemical stability in CO₂, slightly lower conductivity than the unmodified material, an ionic transport number of ~0.9 at 600 °C, and overall positions it as a promising low‑temperature solid oxide fuel cell electrolyte.
The influence of transition metal oxides additives, especially zinc oxide, on the densification and electrical properties of doped barium zirconate have been examined. With the use of zinc oxide as a sintering aid, BaZr 0.85 Y 0.15 O 3–δ was readily sintered to above 93% of theoretical density at 1300°C. Scanning electron microscopic investigations showed Zn accumulation in the intergranular regions. Thermogravimetric analysis of the material under flowing CO 2 showed ZnO‐modified barium zirconate to exhibit excellent chemical stability. The conductivity, as measured by A.C. impedance spectroscopy under H 2 O saturated nitrogen, was slightly lower than that of unmodified barium zirconate. Electromotive force measurements under fuel cell conditions revealed the total ionic transport number to be ∼0.9 at 600°C. The combination of electrical and chemical properties and good sinterability render ZnO‐modified barium zirconate an excellent candidate for reduced temperature solid oxide fuel cell applications.
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Glycine-nitrate combustion synthesis of oxide ceramic powders
L.A. Chick, Larry R. Pederson, G.D. Maupin et al. · Materials Letters · 1990 · 1.1K citations