Details
| Original language | English |
|---|---|
| Pages (from-to) | 3909-3915 |
| Number of pages | 7 |
| Journal | Journal of the European Ceramic Society |
| Volume | 37 |
| Issue number | 13 |
| Early online date | 9 May 2017 |
| Publication status | Published - Oct 2017 |
Abstract
Highly porous Ca3Co4O9 thermoelectric oxide ceramics for high-temperature application were fabricated by sol–gel synthesis and subsequent conventional sintering. Growth mechanism of misfit-layered Ca3Co4O9 phase, from sol–gel synthesis educts and upcoming intermediates, was characterized by in-situ X-ray diffraction, scanning electron microscopy and transmission electron microscopy investigations. The Ca3Co4O9 ceramic exhibits a relative density of 67.7%. Thermoelectric properties were measured from 373 K to 1073 K. At 1073 K a power factor of 2.46 μW cm−1 K−2, a very low heat conductivity of 0.63 W m−1 K−1 and entropy conductivity of 0.61 mW m−1 K−2 were achieved. The maintained figure of merit ZT of 0.4 from sol–gel synthesized Ca3Co4O9 is the highest obtained from conventional, non-doped Ca3Co4O9. The high porosity and consequently reduced thermal conductivity leads to a high ZT value.
Keywords
- CaCoO, Oxide, Porosity, Thermal conductivity, Thermoelectricity
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Journal of the European Ceramic Society, Vol. 37, No. 13, 10.2017, p. 3909-3915.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Porous Ca3Co4O9 with enhanced thermoelectric properties derived from Sol–Gel synthesis
AU - Bittner, Michael
AU - Helmich, Lailah
AU - Nietschke, Frederik
AU - Geppert, Benjamin
AU - Oeckler, Oliver
AU - Feldhoff, Armin
PY - 2017/10
Y1 - 2017/10
N2 - Highly porous Ca3Co4O9 thermoelectric oxide ceramics for high-temperature application were fabricated by sol–gel synthesis and subsequent conventional sintering. Growth mechanism of misfit-layered Ca3Co4O9 phase, from sol–gel synthesis educts and upcoming intermediates, was characterized by in-situ X-ray diffraction, scanning electron microscopy and transmission electron microscopy investigations. The Ca3Co4O9 ceramic exhibits a relative density of 67.7%. Thermoelectric properties were measured from 373 K to 1073 K. At 1073 K a power factor of 2.46 μW cm−1 K−2, a very low heat conductivity of 0.63 W m−1 K−1 and entropy conductivity of 0.61 mW m−1 K−2 were achieved. The maintained figure of merit ZT of 0.4 from sol–gel synthesized Ca3Co4O9 is the highest obtained from conventional, non-doped Ca3Co4O9. The high porosity and consequently reduced thermal conductivity leads to a high ZT value.
AB - Highly porous Ca3Co4O9 thermoelectric oxide ceramics for high-temperature application were fabricated by sol–gel synthesis and subsequent conventional sintering. Growth mechanism of misfit-layered Ca3Co4O9 phase, from sol–gel synthesis educts and upcoming intermediates, was characterized by in-situ X-ray diffraction, scanning electron microscopy and transmission electron microscopy investigations. The Ca3Co4O9 ceramic exhibits a relative density of 67.7%. Thermoelectric properties were measured from 373 K to 1073 K. At 1073 K a power factor of 2.46 μW cm−1 K−2, a very low heat conductivity of 0.63 W m−1 K−1 and entropy conductivity of 0.61 mW m−1 K−2 were achieved. The maintained figure of merit ZT of 0.4 from sol–gel synthesized Ca3Co4O9 is the highest obtained from conventional, non-doped Ca3Co4O9. The high porosity and consequently reduced thermal conductivity leads to a high ZT value.
KW - CaCoO
KW - Oxide
KW - Porosity
KW - Thermal conductivity
KW - Thermoelectricity
UR - http://www.scopus.com/inward/record.url?scp=85019156694&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2017.04.059
DO - 10.1016/j.jeurceramsoc.2017.04.059
M3 - Article
AN - SCOPUS:85019156694
VL - 37
SP - 3909
EP - 3915
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 13
ER -