Environmentally friendly synthesis methods to obtain the misfit [Ca2CoO3-delta](0.62)[CoO2] thermoelectric material
authors Emerenciano, AA; Araujo, AJM; Grilo, JPF; Macedo, DA; Rasekh, S; Kovalevsky, AV; Paskocimas, CA; Nascimento, RM
nationality International
journal MATERIALS LETTERS
author keywords Ca3Co4O9; Ceramics; Environmentally friendly precursors; Proteic sol-gel synthesis; Electrical properties
keywords CA3CO4O9 CERAMICS; COBALT OXIDE; MICROSTRUCTURE; ENHANCEMENT; PERFORMANCE; CA; BEHAVIOR; C349
abstract This work reports the microstructural and thermoelectric characterization of the misfit [Ca2CoO3-delta](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 mu W/K-2 m at 700 degrees C). (C) 2019 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0167-577X
isbn 1873-4979
year published 2019
volume 254
beginning page 286
ending page 289
digital object identifier (doi) 10.1016/j.matlet.2019.07.053
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000484824500072
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journal impact factor 3.204
5 year journal impact factor 2.785
category normalized journal impact factor percentile 66.536
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