Phonon and charge effects on Seebeck coefficient of Cobalt Oxide
J.W. Lin(林哲緯)1*, Jason Gardner1,2, J. G. Lin2
1Neutron, NSRRC, Hsinchu, Taiwan
2Center for Condensed Matter Sciences, NTU, Taipei, Taiwan
* presenting author:林哲緯,
Cobalt Oxide (CCO) is one of the candidates for oxide thermoelectric materials. It shows considerable electric conductivity, thermal conductivity, ZT value, and Seebeck coefficient. In this work, we measure the powder XRD for the polycrystalline rod of CCO and investigate the stability of CCO by repeating the heating and cooling process. The thermal conductivity and Seebeck coefficient increase after four thermal cycles, resulting into the enhancement of ZT value. The resistance of CCO does not change very much, but the thermal conductivity and Seebeck coefficient do, suggesting the phonon-charge interaction plays an important role on Seebeck effect.

Keywords: Oxide, thermoelectric