New environmentally friendly Ba-Fe-O thermoelectric material by flexible laser floating zone processing

authors	Ferreira, NM; Costa, FM; Kovalevsky, AV; Madre, MA; Torres, MA; Diez, JC; Sotelo, A
nationality	International
journal	SCRIPTA MATERIALIA
author keywords	Directional solidification; Electrical resistivity; Electroceramics; Thermoelectric materials; Ferrites
keywords	MICROSTRUCTURE; PERFORMANCES; CERAMICS; CA
abstract	Ceramics with nominal BaFe(12)Ox composition were processed through laser floating zone technique from 25 to 200 mm/h growth rates. These processing conditions were found to promote microstructural differences between the outer and inner parts of the rods, being more pronounced at higher growth rates. Along with the higher microstructural inhomogeneity, the samples grown at 100 and 200 mm/h display reasonable n-type thermoelectric properties provided by BaFe18Ox phase formation. Their highest power factor measured at 800 degrees C is comparable to the best observed so far in oxide ceramic materials, with additional advantage of high abundance and low costs of Fe2O3, and BaCO3 precursors. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	1359-6462
year published	2018
volume	145
beginning page	54
ending page	57
digital object identifier (doi)	10.1016/j.scriptamat.2017.10.011
web of science category	Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category	Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000417662000013