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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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2008
Major/Subject
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.
Description
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.