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Economical Route to Produce High Seebeck Coefficient Calcium Cobaltate for Bulk Thermoelectric Applications


  • This work was sponsored by Lamar University Research Enhancement Grant under project No. 210381; and the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program, as part of the Propulsion Materials Program under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

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Phase pure calcium cobaltate (Ca1.24Co1.62O3.86) was prepared by Self-propagating High-temperature Synthesis (SHS) followed by a short post heat treatment. Prepared powders were characterized by XRD for phase purity, and SEM for particle size, and distribution. Temperature histories at the center and on the surface of reaction pellet during the SHS process were monitored and recorded. Particle size of synthesized powders was reduced using a planetary mill to increase its specific surface area. Electrical conductivity, thermal conductivity, and Seebeck coefficient of the prepared power were measured and figure of merit was reported.