Details
| Original language | English |
|---|---|
| Article number | 100103 |
| Journal | Open Ceramics |
| Volume | 6 |
| Early online date | 20 Apr 2021 |
| Publication status | Published - Jun 2021 |
Abstract
Ceramic composites were produced by combining the oxide materials Ca3Co4−xO9+δ and La2NiO4+δ. Both compounds were characterized by a plate-like crystal shape, but crystal sizes differed by around two orders of magnitude. The composite materials could be successfully prepared by using uniaxial pressing of powder mixtures and pressureless sintering to a porous ceramic. Possible reactions between both materials during sintering were analyzed. The ceramic composites with low amounts of La2NiO4+δ showed enhanced thermoelectric properties, caused by an increasing power factor and simultaneously decreasing thermal conductivity. For the evaluation of the thermoelectric properties, two different types of Ioffe plots were utilized. The maximum figure-of-merit zT at 1073 K was 0.27 for the pure Ca3Co4−xO9+δ as well as for the sample containing 5 wt% La2NiO4+δ. However, the average ZT¯ in the temperature range of 373 K to 1073 K could be increased by 20% for the composite material.
Keywords
- Calcium cobalt oxide, Ceramic, Composite, Figure-of-merit, Lanthanum nickelate, Power factor, Reaction sintering, Thermoelectric
ASJC Scopus subject areas
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Materials Chemistry
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In: Open Ceramics, Vol. 6, 100103, 06.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ceramic composites based on Ca3Co4−xO9+δ and La2NiO4+δ with enhanced thermoelectric properties
AU - Hinterding, Richard
AU - Zhao, Zhijun
AU - Wolf, Mario
AU - Jakob, M.
AU - Oeckler, O.
AU - Feldhoff, Armin
N1 - Funding Information: This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 325156807 . Authors gratefully appreciate technical assistance by F. Steinbach.
PY - 2021/6
Y1 - 2021/6
N2 - Ceramic composites were produced by combining the oxide materials Ca3Co4−xO9+δ and La2NiO4+δ. Both compounds were characterized by a plate-like crystal shape, but crystal sizes differed by around two orders of magnitude. The composite materials could be successfully prepared by using uniaxial pressing of powder mixtures and pressureless sintering to a porous ceramic. Possible reactions between both materials during sintering were analyzed. The ceramic composites with low amounts of La2NiO4+δ showed enhanced thermoelectric properties, caused by an increasing power factor and simultaneously decreasing thermal conductivity. For the evaluation of the thermoelectric properties, two different types of Ioffe plots were utilized. The maximum figure-of-merit zT at 1073 K was 0.27 for the pure Ca3Co4−xO9+δ as well as for the sample containing 5 wt% La2NiO4+δ. However, the average ZT¯ in the temperature range of 373 K to 1073 K could be increased by 20% for the composite material.
AB - Ceramic composites were produced by combining the oxide materials Ca3Co4−xO9+δ and La2NiO4+δ. Both compounds were characterized by a plate-like crystal shape, but crystal sizes differed by around two orders of magnitude. The composite materials could be successfully prepared by using uniaxial pressing of powder mixtures and pressureless sintering to a porous ceramic. Possible reactions between both materials during sintering were analyzed. The ceramic composites with low amounts of La2NiO4+δ showed enhanced thermoelectric properties, caused by an increasing power factor and simultaneously decreasing thermal conductivity. For the evaluation of the thermoelectric properties, two different types of Ioffe plots were utilized. The maximum figure-of-merit zT at 1073 K was 0.27 for the pure Ca3Co4−xO9+δ as well as for the sample containing 5 wt% La2NiO4+δ. However, the average ZT¯ in the temperature range of 373 K to 1073 K could be increased by 20% for the composite material.
KW - Calcium cobalt oxide
KW - Ceramic
KW - Composite
KW - Figure-of-merit
KW - Lanthanum nickelate
KW - Power factor
KW - Reaction sintering
KW - Thermoelectric
UR - http://www.scopus.com/inward/record.url?scp=85106629002&partnerID=8YFLogxK
U2 - 10.1016/j.oceram.2021.100103
DO - 10.1016/j.oceram.2021.100103
M3 - Article
AN - SCOPUS:85106629002
VL - 6
JO - Open Ceramics
JF - Open Ceramics
M1 - 100103
ER -