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

Particle size distributions of (a) Ca₃Co₄O₉, (b) Ca_2.95K_0.05Co₄O₉, (c) Ca_2.90K_0.10Co₄O₉, and (d) Ca_2.85K_0.15Co₄O₉, obtained from the SEM images of 50 particles.