Year: 2004
Type: article
Abstract: Thermoelectric properties of layered oxyselenides La1−xSrxCuOSe (x=0.00 to 0.20) were investigated to evaluate the potential as thermoelectric material. Temperature dependence of the electrical conductivity and Seebeck coefficient measured in a temperature range of 373 to 673 K indicated that nondoped LaCuOSe was a p-type degenerate semiconductor due to Cu vacancies, while Sr-doped materials with x=0.05 to 0.20 were p-type metals. The electrical conductivity increased and Seebeck coefficient decreased with increasing Sr concentration up to x=0.10 in La1−xSrxCuOSe, suggesting that the effective hole carriers increase with increasing Sr content up to x=0.10. Thermoelectric power factors were drastically enhanced by the Sr doping, and the value reached 1.0−1.4×10−4 W m−1 K−2 for La0.95Sr0.05CuOSe. Thermal conductivities measured for the materials with x=0.00 and 0.05 were 2.1 W m−1 K−1 and 2.3 W m−1 K−1 at room temperature, respectively. These results lead to an estimation of Z value of 4.4×10−5 K−1 for La0.95Sr0.05CuOSe.
Source: Journal of Applied Physics
DOI: 10.1063/1.1646438
Authors: Masahiro Yasukawa, Kazushige Ueda, Hideo Hosono
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1850248