Effect of a powder compaction process on the thermoelectric properties of Bi.sub.2./sub.Sr.sub.2./sub.Co.sub.1.8./sub.O.sub.x./sub. ceramics

0456260 - FZÚ 2017 RIV GB eng J - Journal Article
Rubešová, K. - Hlásek, T. - Jakeš, V. - Huber, Š. - Hejtmánek, Jiří - Sedmidubský, D.
Effect of a powder compaction process on the thermoelectric properties of Bi₂Sr₂Co_1.8O_x ceramics.
Journal of the European Ceramic Society. Roč. 35, č. 2 (2015), 525-531. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA ČR GA13-17538S
Institutional support: RVO:68378271
Keywords : bismuth cobaltites * sol-gel * thermoelectrics * spark plasma sintering * hot pressing
Subject RIV: CA - Inorganic Chemistry
Impact factor: 2.933, year: 2015

Bi-Sr-Co-O ceramics, as members of a thermoelectric cobaltite family, do not reach the quality of thermoelectric compounds used at lowtemperatures. Their thermoelectric performance can be, however, boosted by the microstructure tailoring or by the variation of cobalt valence. Inthis work, we compare Bi2Sr2Co1.82Ox polycrystalline samples that were compacted using different procedures. The precursor powder was preparedby a chelating sol–gel method. Three compaction methods were subsequently tested: (i) cold uniaxial pressing, (ii) hot uniaxial pressing on BELT equipment and (iii) spark plasma sintering, all three followed by additional annealing in air.
Permanent Link: http://hdl.handle.net/11104/0256818