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Coffey, Greg W.
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Publications (8/8 displayed)
- 2015Concept Feasibility Report for Electroplating Zirconium onto Uranium Foil - Year 2
- 2013Silver nanorod arrays for photocathode applicationscitations
- 2010Degradation Mechanisms of SOFC Anodes in Coal Gas Containing Phosphoruscitations
- 2010Calcium- and Cobalt-doped Yttrium Chromites as an Interconnect Material for Solid Oxide Fuel Cellscitations
- 2007Electrode Performance in Reversible Solid Oxide Fuel Cellscitations
- 2006Electrical, Thermoelectric, and Structural Properties of La(MxFe1-x)O3 (M=Mn, Ni, Cu)citations
- 2006High Temperature Corrosion Behavior of Oxidation Resistant Alloys under SOFC Interconnect Dual Exposures
- 2004ELECTRODE DEVELOPMENT FOR REVERSIBLE SOLID OXIDE FUEL CELLS
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article
Electrical, Thermoelectric, and Structural Properties of La(MxFe1-x)O3 (M=Mn, Ni, Cu)
Abstract
Electrical, thermoelectric, and structural properties are studied in transition metal ion-doped LaFeO3: La(MnxFe1-x)O3, La(NixFe1-x)O3, and La(CuxFe1-x)O3. Structural analysis showed that a continuous series of solid solutions with no intermediate phases are formed over a wide range (0 < x < 1) with dopants of Mn and Ni, whereas the maximum Cu content is 30% from this study. The Ni-doped LaFeO3 specimens have substantially higher conductivity than those doped with either Mn or Cu, measured in air from 100°C to 1000°C. The Seebeck coefficient of La(MnxFe1-x)O3 and La(CuxFe1-x)O3 has a strong temperature dependence, indicating a thermally activated carrier formation. The activation energy for carrier formation in La(CuxFe1-x)O3 is greater than that in La(MnxFe1-x)O3. Thermoelectric and electrical properties evidence conduction through polaron hopping in both Mn- and Cu-doped LaFeO3, whereas the Ni-doped ones are metallic conductors.