Thermoelectric properties of lower concentration K-doped Ca3Co4O9 ceramics

Thermoelectric properties of lower concentration K-doped Ca₃Co₄O₉ ceramics

Li Ya-Nan¹, Wu Ping^{1, †}, Zhang Shi-Ping¹, Chen Sen¹, Yan Dan¹, Yang Jin-Guang¹, Wang Li², Huai Xiu-Lan³

(color online) Thermoelectric properties of Ca_3–xK_xCo₄O₉ samples. (a) Temperature-dependent electrical conductivities for Ca_3–xK_xCo₄O₉ samples. (b) Relationships between ln(σT) and 1000/T for Ca_3–xK_xCo₄O₉ samples. Inset: K content dependent activation energy (E_a) values. (c) Temperaturedependent Seebeck coefficients. (d) Temperature-dependent power factors. (e) Temperature-dependent total thermal conductivity k values. (f) Temperaturedependent carrier thermal conductivity k_c values and the phonon thermal conductivity k_p values for Ca_3–xK_xCo₄O₉ samples.