article
Environmentally friendly synthesis methods to obtain the misfit [Ca2CoO3-d]0.62[CoO2] thermoelectric material
Registro en:
0167-577X
10.1016/j.matlet.2019.07.053
Autor
Paskocimas, Carlos Alberto
Emerenciano, Aline Alencar
Araújo, Allan Jedson Medeiros de
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Rasekh, Shahed
Kovalevsky, Andrei V.
Nascimento, Rubens Maribondo do
Resumen
This work reports the microstructural and thermoelectric characterization of the misfit [Ca2CoO3-d]0.62[CoO2] compound obtained by a solid-state synthesis using mollusk shells and a proteic sol-gel method, which uses gelatin as a polymerizing agent. The results clearly demonstrate the capability of these routes to produce pure Ca3Co4O9 with plate-like morphology. Sintered ceramic samples show randomly oriented grains and relative densities in the range of 63–67%. The obtained microstructures provide reasonable electrical properties and result in competitive thermoelectric performance for the material prepared by the proteic sol-gel synthesis (P.F. of 205 lW/K2 m at 700 C) 2021-12