| Autor: |
Migiakis, P., Androulakis, J., Giapintzakis, J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 12/15/2003, Vol. 94 Issue 12, p7616-7620, 5p, 6 Graphs |
| Abstrakt: |
We present the results of a systematic investigation of the thermal conductivity, Seebeck coefficient and electrical resistivity for selected members (x=0.3, 0.7, 0.8, and 1) of the LaNi[sub 1-x]Co[sub x]O[sub 3] solid solution in the temperature range of 80<=T<=320 K. Substitution of Ni by Co drives the system from n-type metallic phase with low thermopower values into p-type semiconducting phase with high thermopower values of the order of hundreds of μV/K. But the thermal conductivity observed varies only slightly with the composition, x, over the temperature range investigated. The latter effect also holds true for the lightly hole doped x=0.8 member (in substituting Sr for La). Our results suggest that semiconducting members of the LaNi[sub 1-x]Co[sub x]O[sub 3] solid solution can be classified as “phonon glass and electron crystal” systems. The highest room temperature figure of merit was exhibited by the x=0.8 member (ZT=0.022), which is comparable to that of single crystal NaCo[sub 2]O[sub 4] (ZT=0.03). © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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