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High-Temperature Electrical Transport Behavior Observed in the La1.96M0.04CuO4 (M: Mg, Ca, Sr) Polycrystalline Ceramics

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We prepared high-density La1.96M0.04CuO4 (M: Mg, Ca, Sr) polycrystalline ceramics by a spark plasma sintering method, and investigated the temperature dependence of the electrical conductivity, Seebeck coefficient, and power factor. Our results indicate that the relative density of these sintered ceramic samples can reach nearly 100%, and alkaline earth metal ions doping can increase the activation energy (from 0.021 to 0.128 eV). All ceramic samples show high positive Seebeck coefficient (∼100–510 V/K). The obtained Sr-doped La2CuO4 ceramics show better thermoelectric properties, which potentially make them for thermoelectric applications.
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Document Type: Research Article

Affiliations: 1: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Publication date: 2008-06-01

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