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) (a) XRD patterns of sintered Ca_3–xK_xCo₄O₉ (x = 0, 0.05, 0.10, 0.15) bulk samples in the direction perpendicular to pressure direction, and (b) grain orientation degree (L) and (c) density versus x value of the Ca_3–xK_xCo₄O₉ samples.