Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/54240
Title: Effects of Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf> dopant on microstructure and thermoelectric properties of Na<inf>x</inf>CoO<inf>2</inf> ceramics
Authors: Suwapitcha Buntham
Sukanda Jiansirisomboon
Anucha Watcharapasorn
Keywords: Chemical Engineering
Chemistry
Engineering
Materials Science
Physics and Astronomy
Issue Date: 1-Nov-2015
Abstract: Copyright © 2015 American Scientific PublishersAll rights reserved. Bi0.5Na0.5TiO3-doped NaxCoO2 ceramics with varied doping concentration of 0, 0.01, 0.03, 0.05 and 0.07 mol fraction were prepared by conventional solid state reaction method. The firing condition used was 950 °C for 8 h. X-ray diffraction pattern results showed that all produced ceramics were single phase with a hexagonal structure. Due to the substitution of BNT inside NaxCoO2 lattice, there was a slight shift of X-ray diffraction pattern to the left which indicated the lattice expansion. The scanning electron micrographs of ceramics indicated that small amount of BNT addition could eliminate pore and improved densification. A small amount of undissolved BNT was also present in NaxCoO2 matrix and dispersed at grain boundaries causing a decrease in grain size of the ceramic. The electrical conductivity and Seebeck coefficient of ceramics showed that all samples possessed metallic conduction behavior. However, BNT addition caused a reduction of electrical conductivity, Seebeck coefficient and power factor of NaxCoO2 ceramics.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84944769323&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/54240
ISSN: 15334899
15334880
Appears in Collections:CMUL: Journal Articles

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