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Thomsen, Ed C.
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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.