We have successfully prepared thermoelectric materials NaCo 2O4-δ at lower temperature (700°C) using aqueous sol-gel methods. We find that the electrical resistivity and thermopower of NaCo2O4-δ depend strongly on the sintering temperature and partial pressure of oxygen. The oxygen content of NaCo 2O4-δ is found to decrease with increasing sintering temperature. The sample prepared at the combination of 700°C and pure flowing oxygen exhibits the highest value of power factor.
|Number of pages||5|
|Journal||Journal of Materials Science|
|Publication status||Published - 2004 Jul 15|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering