Studies on the power factor of (Ba,Sr)Co2+x Ru4−x O11 compounds

Abstract: We have prepared polycrystalline single-phase ACo2+x Ru4−x O11 (A=Sr, Ba; 0≤ x ≤0.5) using the ceramic method and we have studied their structure, electrical resistivity and Seebeck coefficient, in order to estimate their power factor (P.F.). These layered compounds show values of electrical resistivity of the order of 10−5 Ωm and their Seebeck coefficients are positive and range from 1μVK−1 (T =100K) to 20μVK−1 (T =450K). The maximum power factor at room temperature is displayed by BaCo2Ru4O11 (P.F.: 0.20μWK−2 cm−1), value that is comparable to that shown by compounds such as SrRuO3 and Sr6Co5O15. [ABSTRACT FROM AUTHOR]