Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F15%3A43897416" target="_blank" >RIV/60461373:22310/15:43897416 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/15:00456260
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S095522191400466X" target="_blank" >http://www.sciencedirect.com/science/article/pii/S095522191400466X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2014.08.037" target="_blank" >10.1016/j.jeurceramsoc.2014.08.037</a>

Result language
angličtina
Original language name
Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics
Original language description
Bi-Sr-Co-O ceramics, as members of a thermoelectric cobaltite family, do not reach the quality of thermoelectric compounds used at low temperatures. Their thermoelectric performance can be, however, boosted by the microstructure tailoring or by the variation of cobalt valence. In this work, we compare Bi2Sr2Co1.82Ox polycrystalline samples that were compacted using different procedures. The precursor powder was prepared by 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. The thermoelectric ceramics were characterized by XRD, SEM and electric transport measurement up to 950 K. The temperature dependence of the power factor and the figure of merit were also calculated. The spark plasma sintering process yielded a material with an improved value of Seebeck coefficient - 190 ?V/K at 300 oC - the highest value reported for the polycrystalline Bi-222 material so far.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CA - Inorganic chemistry
OECD FORD branch
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Project
<a href="/en/project/GA13-17538S" target="_blank" >GA13-17538S: Oxide Thermoelectric Materials for High Temperature Waste Heat Recovery</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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