Preparation of High Seebeck Coefficient Calcium Cobaltate Thermoelectric Powders

Abstract

Thermoelectric calcium cobalt oxide (Ca1.24Co1.62O3.86) with high Seebeck coefficient was prepared by self-propagating high temperature synthesis (SHS) followed by a short post treatment process. Synthesized samples were analyzed by XRD for their phase purity for samples prepared from different reactants mixtures. A final element model of SHS of calcium cobalt oxide was developed to study the temperature history and reaction rate change during the synthesis. This model can be used to predict reaction temperatures for various initial conditions.

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

“…under a load of 1 metric ton (25 MPa). Pellets were reacted inside a custom‐made SHS reactor under an oxygen atmosphere as reported previously . Two R ‐type thermocouples (Omega CHAL‐020, Stamford, CT) were inserted into the pellets to measure the temperature history at the centerline of the pellet and the pellet surface temperature history was recorded using a short wavelength IR camera.…”