Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Ashley S. Harvey"'
Publikováno v:
Chem. Mater.
Iron perovskites of the ABO3 type with stoichiometry La1/2Sr1/2Fe(1 x)MexO3 d have been substituted with 10 Ta and 20 Ti and heat treated in air or in argon. 10 substitution of iron by tantalum in the hole doped La1/2Sr1/2FeO3 decreases the electric
Autor:
Anna Infortuna, Ashley S. Harvey, Ludwig J. Gauckler, Zhèn Yáng, Julia Martynczuk, Konstantin Efimov, Peter Kocher
Publikováno v:
Chemistry of Materials. 23:3169-3175
Ba(0.8)Sr(0.2)Co(0.8)Fe(0.2)O(3-delta) exists as a single cubic phase at 1000 degrees C in air. Upon slow cooling, it transforms, between 900 and 700 degrees C, to a mixture of cubic, hexagonal, and rhombohedral phases, as evidenced by X-ray diffract
Publikováno v:
Scripta Materialia. 61:1083-1086
A potential high-performance solid oxide fuel cell cathode material, Ba0.2Sr0.8Co0.8Fe0.2O3−δ, was synthesized by a solid-state reaction method. As atmospheric CO2 may degrade its cathodic performance, the reaction of this material to different ga
Publikováno v:
Journal of Applied Crystallography. 42:153-160
Selected compositions of the Ba–Sr–Co–Fe–O system were synthesized from powders by the solid-state reaction method. Samples were equilibrated at 1273 K for 36 000 s in air. The resulting powders were characterized by X-ray diffraction (XRD) a
Publikováno v:
Physica B: Condensed Matter. 403:87-94
Systematic valence changes in Pr 1− x Sr x Mn 1− y In y O 3− δ upon cation substitution with Sr 2+ and In 3+ have been found using Mn K-edge and Pr L-edge X-ray absorption, and Mn L II,III and Pr M IV,V electron energy-loss spectroscopy. The a
Publikováno v:
Advanced Functional Materials. 18:127-135
Yttrium-stabilized zirconia (YSZ) and cerium gadolinium oxide (CGO) thin films were prepared by pulsed laser deposition (PLD) under different ambient pressures and substrate temperatures. The microstructures of the obtained films are compared with ex
Autor:
Subhash H. Risbud, Alexandra Navrotsky, Ian M. Kennedy, Bing Guo, John M. Neil, Ashley S. Harvey
Publikováno v:
Journal of the American Ceramic Society. 90:3683-3686
We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20–60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE2O3 (RE=Dy, Ho, Er, Tm, and Yb). The RE2O3 nanopartic
Autor:
Anna Infortuna, Ashley S. Harvey, Anja Bieberle-Hütter, Jennifer L. M. Rupp, Ludwig J. Gauckler, Ulrich P. Muecke, Daniel Beckel, Michel Prestat
Publikováno v:
Journal of Power Sources. 173:325-345
Thin film deposition as applied to micro solid oxide fuel cell (μSOFC) fabrication is an emerging and highly active field of research that is attracting greater attention. This paper reviews thin film (thickness ≤1 μm) deposition techniques and c
Ba1-xSrxCo1-yFeyO3-δ Perovskites Bulk and Thin Films: Phase Compositions and Electrical Conductivity
Publikováno v:
ECS Transactions. 7:1225-1228
Ba0.5Sr0.5Co0.8Fe0.2O3-δ showed good performance as cathode material on doped ceria electrolyte for intermediate temperature solid oxide fuel cells (1). This cathode exhibits high power densities when operated with humidified hydrogen as the fuel an
Publikováno v:
Philosophical Magazine Letters. 86:457-467
Synthesis of phase-pure cubic and monoclinic Y2O3 nanoparticles (16–90 nm) was achieved in a gas-phase flame process. The effect of process parameters on the crystal structure of the Y2O3 nanoparticles was systematically investigated by X-ray diffr