Promising high temperature thermoelectric properties of dense Ba2Co9O14 ceramics

Abstract

Layered cobalt oxides have shown high thermoelectric properties. The n=1 member of the Ban+1ConO3n+3(Co8O8) family, Ba2Co9O14, a new layered cobalt oxides family with Co(II) and Co(III) in the CdI2 layers, has been synthesized by solid state reaction and sintered as dense ceramics (relative density∼93%) by Spark Plasma Sintering. It presents promising p-type thermoelectric properties at high temperature. The dimensionless figure of merit ZT is 0.032 at 660K and 0.04 at 1000K, which is about one quarter to one third of the ZT value of Ca3Co4O9 ceramics.