Preparation of high temperature p-type Oxide-based thermoelectric materials Prof. Yuanhua Lin, State Key Laboratory of New Ceramics and Fine Processing, Dept. of Materials Science & Engineering, Tsinghua University, Beijing 100084, China. Email: [email protected] Thermoelectric materials can directly convert heat into electric energy and vice versa through the thermoelectric phenomena in solids, which hold great promise for clean energy generation by transforming the heat into electricity due to the Seebeck effect. As for the TE materials, a large thermoelectric power S, large electrical conductivity σ, and low thermal conductivity κ are highly desired for the development of a practical thermoelectric materials. Many efforts have been devoted in these recent years to improving TE properties to misfit-layered oxides materials. It is generally believed that texturation with high grain orientation in polycrystalline oxides ceramics can be used to improve the electrical, mechanical and optical properties. Some previous experimental results revealed that highly preferred orientation could be effective in reducing the resistivity due to the shorter carrier path and the reduction in the scattering of the carriers at the grain boundaries or defects. Based on the previous research results, in this research project, we will consider the high-temperature oxide TE materials. Misfit-layered cobaltites, such as NaCo2O4, Ca3Co4O9, Ca2Co2O5, Bi2Sr2Co2Ox, have attracted much attention due to their promising TE properties and high decomposition temperatures, especially Ca-Co-O-based compounds.One way is to improve the electric conductivity, and another way is to reduce the thermal conductivity. Therefore, we will choose some special processing technology to make the oxide ceramics high dense and high orientation to improve its electric conductivity. Additionally, we will control the grain size by the processing technology to control the thermal conductivity properties. It will be helpful to improve the thermoelectric properties.