Title :
Thermal conductivity control of ZnO thermoelectric ceramics using hot-pressing method
Author :
Fujishiro, Y. ; Awano, M. ; Moon, J. ; Maeda, K.
Author_Institution :
Synergy Mater. Res. Center, Nat. Inst. of Adv. Ind. Sci. & Technol. (AIST), Nagoya, Japan
Abstract :
Nanostructural ZnO ceramics was prepared using Al doped ZnO nano-powders by low-temperature HPing at 950°C for 3h. Al-doped ZnO nano-powders was obtained by chemical processing of both co-precipitation and spray drying at 120°C. Power factor of the prepared ZnO ceramics is 5.0×10-4 Wm-1K-2, which increased ca. 20% by HP sintering at 950°C. The prepared nanostructural ZnO ceramics showed lower thermal conductivity than that of normal sintered ceramics at the lower temperature range.
Keywords :
aluminium; ceramics; hot pressing; nanoparticles; semiconductor materials; sintering; thermal conductivity; thermoelectricity; zinc compounds; 3 h; 950 degC; ZnO; ZnO:Al; chemical processing; co-precipitation; hot-pressing; nanopowders; nanostructural ceramics; sintering; spray drying; thermal conductivity; thermoelectric ceramics; Ceramics; Conducting materials; Microstructure; Powders; Pressing; Reactive power; Thermal conductivity; Thermoelectricity; X-ray scattering; Zinc oxide;
Conference_Titel :
Thermoelectrics, 2002. Proceedings ICT '02. Twenty-First International Conference on
Print_ISBN :
0-7803-7683-8
DOI :
10.1109/ICT.2002.1190288
