Fabrication and thermoelectric characteristics of [(Bi,Pb)[sub 2]Ba[sub 2]O[sub 4±w]][sub 0.5]CoO[sub 2] bulks with highly aligned grain structure

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© 2008 AIP Publishing. This is the accepted version of the following article: Motohashi, T. & Nonaka, Y. & Sakai, K. & Karppinen, Maarit & Yamauchi, H. 2008. Fabrication and thermoelectric characteristics of [(Bi,Pb)[sub 2]Ba[sub 2]O[sub 4±w]][sub 0.5]CoO[sub 2] bulks with highly aligned grain structure. Journal of Applied Physics. Volume 103, Issue 3. 033705/1-6. ISSN 0021-8979 (printed). DOI: 10.1063/1.2838161, which has been published in final form at http://scitation.aip.org/content/aip/journal/jap/103/3/10.1063/1.2838161.

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Volume Title

School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2008

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Mcode

Degree programme

Language

en

Pages

033705/1-6

Series

Journal of Applied Physics, Volume 103, Issue 3

Abstract

Here, we report fabrication and thermoelectric characteristics of polycrystalline bulks with aligned grains of the misfit-layered cobalt oxides, [(Bi1−xPbx)2Ba2O4±w]0.5CoO2. High-quality precursor powder was prepared with a spray-drying technique. The precursor was then sintered under a uniaxial pressure to yield dense bulk samples consisting of highly aligned grains. The electrical conductivity of such samples was four times higher than that of conventionally sintered bulks. Accordingly, the thermoelectric characteristics of the grain-aligned specimens were enhanced.

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Keywords

powders, lead, sintering, cobalt oxides, electrical resistivity, thermoelectric characteristics

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Citation

Motohashi, T. & Nonaka, Y. & Sakai, K. & Karppinen, Maarit & Yamauchi, H. 2008. Fabrication and thermoelectric characteristics of [(Bi,Pb)[sub 2]Ba[sub 2]O[sub 4±w]][sub 0.5]CoO[sub 2] bulks with highly aligned grain structure. Journal of Applied Physics. Volume 103, Issue 3. 033705/1-6. ISSN 0021-8979 (printed). DOI: 10.1063/1.2838161.