Abstract
Polycrystalline Na1-x Co2O4 is a promising p-type oxide thermoelectric, and it was investigated in a property-processing study to enhance the thermoelectric properties for high temperature applications. The density of the ceramics was improved by a post-milling process, and consequently, we obtained better thermoelectric power factors (PF) due to an associated improvement in electrical conductivity. Through a milling process, and sintering at 1203 K, we obtained an enhanced thermoelectric power factor of ~4 μW/cm K2 at 500 K for randomly orientated polycrystalline ceramics. The Seebeck coefficient variation with temperature demonstrates through modeling that the conduction mechanism changed from metallic to a semiconducting behavior between temperatures 300 to 400 K.
Original language | English (US) |
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Pages (from-to) | 2064-2070 |
Number of pages | 7 |
Journal | Journal of Materials Science |
Volume | 46 |
Issue number | 7 |
DOIs | |
State | Published - Apr 2011 |
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Ceramics and Composites
- Mechanical Engineering
- Polymers and Plastics
- General Materials Science
- Materials Science (miscellaneous)