Abstract
We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu 2 CoTi 3 S 8 , which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu 2−x CoTi 3 S 8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.
| Original language | English |
|---|---|
| Pages (from-to) | 5-10 |
| Number of pages | 6 |
| Journal | Journal of Solid State Chemistry |
| Volume | 259 |
| DOIs | |
| Publication status | Published - Mar 1 2018 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry
Cite this
Carrier concentration tuning in thermoelectric thiospinel Cu 2 CoTi 3 S 8 by oxidative extraction of copper . / Hashikuni, Katsuaki; Suekuni, Koichiro; Watanabe, Kosuke; Bouyrie, Yohan; Ohta, Michihiro; Ohtaki, Michitaka; Takabatake, Toshiro.
In: Journal of Solid State Chemistry, Vol. 259, 01.03.2018, p. 5-10.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Carrier concentration tuning in thermoelectric thiospinel Cu 2 CoTi 3 S 8 by oxidative extraction of copper
AU - Hashikuni, Katsuaki
AU - Suekuni, Koichiro
AU - Watanabe, Kosuke
AU - Bouyrie, Yohan
AU - Ohta, Michihiro
AU - Ohtaki, Michitaka
AU - Takabatake, Toshiro
PY - 2018/3/1
Y1 - 2018/3/1
N2 - We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu 2 CoTi 3 S 8 , which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu 2−x CoTi 3 S 8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.
AB - We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu 2 CoTi 3 S 8 , which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu 2−x CoTi 3 S 8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.
UR - http://www.scopus.com/inward/record.url?scp=85040012936&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85040012936&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2017.12.031
DO - 10.1016/j.jssc.2017.12.031
M3 - Article
AN - SCOPUS:85040012936
VL - 259
SP - 5
EP - 10
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
ER -