| Autor: |
Mikami, M., Funahashi, R., Yoshimura, M., Mori, Y., Sasaki, T. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 11/15/2003, Vol. 94 Issue 10, p6579-6582, 4p, 1 Diagram, 4 Graphs |
| Abstrakt: |
We measured the high-temperature thermoelectric properties of single-crystal Ca[sub 3]Co[sub 2]O[sub 6], which consists of parallel one-dimensional Co[sub 2]O[sub 6][sup 6-] chains separated by Ca[sup 2+] ions. The resistivity (ρ) along the c-axis decreases rapidly upon increasing temperature from 2×10[sup 4] to 8 mΩ cm in a temperature region of 300 to 1073 K. The Seebeck coefficient (S) is positive and is 230 and 160 μV/K at 373 and 1073 K, respectively. The thermal conductivity (κ) is as low as 8 W/mK at room temperature and decreases linearly with the increase of temperature to 4.6 W/mK at 773 K. Thus, the estimated dimensionless figure-of-merit [ZT=(S[sup 2]/ρκ)T (T: absolute temperature)], is about 0.15 at 1073 K. As the thermoelectric figure-of-merit (Z), shows a sharp rise in the measured temperature range, Ca[sub 3]Co[sub 2]O[sub 6] is expected to possess high thermoelectric efficiency at higher temperatures, and is considered to be a potential candidate for use as a thermoelectric material at high temperatures by virtue of being chemically stable up to 1300 K. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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