We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl1-xMgxO2 (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl1-xMgxO2 bodies crystallized in CuAl1-xMgxO2 solid solutions along with MgAl2O4 and Cu2MgO3 phases. Mg substitution up to x = 0.12 in the CuAl1-xMgxO2 yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10-5 W m-1 K-2) was attained for CuAl0.88Mg0.12O2 at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.
|Number of pages||4|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2007 Jul 6|
- Electrical conductivity
- Electron microscopy
ASJC Scopus subject areas
- Ceramics and Composites