Improved thermoelectric characteristics of Si-doped misfit-layered cobaltite

0366985 - FZÚ 2012 RIV US eng J - Článek v odborném periodiku
Liu, Ch.-J. - Huang, Y.-Ch. - Nong, N.V. - Liu, Y.-L. - Petříček, Václav
Improved thermoelectric characteristics of Si-doped misfit-layered cobaltite.
Journal of Electronic Materials. Roč. 40, č. 5 (2011), 1042-1045. ISSN 0361-5235. E-ISSN 1543-186X
Grant ostatní: AV ČR(CZ) AP0701
Program: Akademická prémie - Praemium Academiae
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: thermoelectrics * cobaltite * power factor
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.466, rok: 2011

The cobaltite Ca3Co4O9+δ has shown large thermopower and is considered to be a good candidate for use as a thermoelectric material. In this paper, we report measurements of the electrical resistivity and Seebeck coefficient for a series of misfit-layered oxides Ca3Co4-xSixO9+δ prepared by solid-state reaction. Structural parameters are refined with the superspace group X2/m(0b0)s0 using powder x-ray diffraction data. With partial substitution of Si4+ for Co3+, the resistivity decreases, while the thermopower increases simultaneously. These results indicate that partial substitution of Si4+ improves the thermoelectric characteristics of Ca3Co4O9+δ.
Trvalý link: http://hdl.handle.net/11104/0006654