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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A new approach to obtain calcium cobalt oxide by microwave-assisted hydrothermal synthesis

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Author(s):
Medina, M. S. [1, 2] ; Bernardi, J. C. [1] ; Zenatti, A. [1] ; Escote, M. T. [1]
Total Authors: 4
Affiliation:
[1] Fed Univ ABC, Ctr Engn Modeling & Appl Social Sci, UFABC, Santo Andre, SP - Brazil
[2] Energy & Nucl Res Inst, Ctr Sci & Technol Mat, Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 46, n. 2, p. 1596-1600, FEB 1 2020.
Web of Science Citations: 0
Abstract

This study describes the effect of microwave-assisted hydrothermal synthesis on the crystalline phase-formation, microstructural characteristics, and thermoelectric performance of Ca3Co4O9. Synthesis parameters, such as time, temperature, KOH concentration, and oxidation states of Co ions, to produce this compound, were studied. X-ray diffraction and X-ray photoelectron spectroscopy showed that the most critical parameters for the phase formation are the oxidation states of Co ions. Ca3Co4O9 can be obtained by microwave-assisted hydrothermal synthesis at 503 K for 30 min and thermal treatment at 1173 K for 120 min. Scanning electron microscopy images showed that the sample exhibits randomly oriented particles with plate-like morphology and range size between 0.4 and 1.2 mu m. From measurements of electrical resistivity, thermal conductivity, and Seebeck coefficient, we obtained a figure of merit of similar to 0.008 at 300 K. (AU)

FAPESP's process: 16/03575-2 - Electrical transport in nanostructured RNiO3 compounds
Grantee:Márcia Tsuyama Escote
Support Opportunities: Regular Research Grants