Details
| Original language | English |
|---|---|
| Pages (from-to) | 1592-1599 |
| Number of pages | 8 |
| Journal | Journal of the European Ceramic Society |
| Volume | 38 |
| Issue number | 4 |
| Early online date | 6 Nov 2017 |
| Publication status | Published - Apr 2018 |
Abstract
Due to high figure of merit, Ca3Co4 − xO9 + δ (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and post-calcination on stability, microstructure and thermoelectric properties is reported. By a new post-calcination approach, single-phase materials were obtained from precursors to final dense ceramics in one step. The highest zT of 0.11 was recorded at 800 °C for CCO with 98 and 72% relative densities. In situ high-temperature X-ray diffraction in air and oxygen revealed a higher stability of CCO in oxygen (∼970 °C) than in air (∼930 °C), with formation of Ca3Co2O6 which also showed high stability in oxygen, even at 1125 °C. Since achievement of phase pure high density CCO by post-calcination method in air is challenging, the phase stability of CCO in oxygen is important for understanding and further improvement of the method.
Keywords
- CaCoO, Microstructure, Phase stability, Post calcination, Thermoelectric performance
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the European Ceramic Society, Vol. 38, No. 4, 04.2018, p. 1592-1599.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of processing on stability, microstructure and thermoelectric properties of Ca3Co4 − xO9 + δ
AU - Kanas, Nikola
AU - Singh, Sathya Prakash
AU - Rotan, Magnus
AU - Saleemi, Mohsin
AU - Bittner, Michael
AU - Feldhoff, Armin
AU - Norby, Truls
AU - Wiik, Kjell
AU - Grande, Tor
AU - Einarsrud, Mari Ann
N1 - Funding Information: Financial support from The Research Council of Norway under the program Nano2021 to the project (Number 228854 ) “Thermoelectric materials: Nanostructuring for improving the energy efficiency of thermoelectric generators and heat-pumps” (THELMA). Professor Mats Johnsson, Stockholm University is acknowledged for support on SPS. Antoine R. M. Dalod (NTNU) is acknowledged for fruitful discussions.
PY - 2018/4
Y1 - 2018/4
N2 - Due to high figure of merit, Ca3Co4 − xO9 + δ (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and post-calcination on stability, microstructure and thermoelectric properties is reported. By a new post-calcination approach, single-phase materials were obtained from precursors to final dense ceramics in one step. The highest zT of 0.11 was recorded at 800 °C for CCO with 98 and 72% relative densities. In situ high-temperature X-ray diffraction in air and oxygen revealed a higher stability of CCO in oxygen (∼970 °C) than in air (∼930 °C), with formation of Ca3Co2O6 which also showed high stability in oxygen, even at 1125 °C. Since achievement of phase pure high density CCO by post-calcination method in air is challenging, the phase stability of CCO in oxygen is important for understanding and further improvement of the method.
AB - Due to high figure of merit, Ca3Co4 − xO9 + δ (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and post-calcination on stability, microstructure and thermoelectric properties is reported. By a new post-calcination approach, single-phase materials were obtained from precursors to final dense ceramics in one step. The highest zT of 0.11 was recorded at 800 °C for CCO with 98 and 72% relative densities. In situ high-temperature X-ray diffraction in air and oxygen revealed a higher stability of CCO in oxygen (∼970 °C) than in air (∼930 °C), with formation of Ca3Co2O6 which also showed high stability in oxygen, even at 1125 °C. Since achievement of phase pure high density CCO by post-calcination method in air is challenging, the phase stability of CCO in oxygen is important for understanding and further improvement of the method.
KW - CaCoO
KW - Microstructure
KW - Phase stability
KW - Post calcination
KW - Thermoelectric performance
UR - http://www.scopus.com/inward/record.url?scp=85033565258&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2017.11.011
DO - 10.1016/j.jeurceramsoc.2017.11.011
M3 - Article
AN - SCOPUS:85033565258
VL - 38
SP - 1592
EP - 1599
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 4
ER -