Navegando por Autor "Araújo, Allan Jedson Medeiros de"
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Artigo Environmentally friendly synthesis methods to obtain the misfit [Ca2CoO3-d]0.62[CoO2] thermoelectric material(Elsevier, 2019-11-01) 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 doThis 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)