THERMOELECTRIC PROPERTIES OF NaCo2-xCuxO4 IMPROVED BY THE SUBSTITUTION OF Cu FOR Co

Authors prepared a set of polycrystalline samples of the thermoelectric oxide Na1.2Co2-xCuxO4 (x=0, 0.1, 0.2 and 0.3), and investigated the Cu substitution effects on their thermoelectric properties. The substituted Cu enhances the thermopower over the temperature range from 4 to 300 K, whereas it d...

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Published in:Jpn.J.Appl.Phys ,Part 2. Vol. 40, no. 1A/B, pp. L65-L67. 2001 Part 2. Vol. 40, no. 1A/B, pp. L65-L67. 2001, 2001-01, Vol.40 (1A/B), p.L65-L67
Main Authors: Terasaki, I, Ishii, Y, Tanaka, D, Takahata, K, Iguchi, Y
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container_title Jpn.J.Appl.Phys ,Part 2. Vol. 40, no. 1A/B, pp. L65-L67. 2001
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creator Terasaki, I
Ishii, Y
Tanaka, D
Takahata, K
Iguchi, Y
description Authors prepared a set of polycrystalline samples of the thermoelectric oxide Na1.2Co2-xCuxO4 (x=0, 0.1, 0.2 and 0.3), and investigated the Cu substitution effects on their thermoelectric properties. The substituted Cu enhances the thermopower over the temperature range from 4 to 300 K, whereas it does not appreciably change the resistivity and the thermal conductivity. As a result, the thermoelectric figure of merit increases by five times at 100 K from x=0 to 0.3. The Cu substitution effects observed are highly incompatible with usual impurity effects that increase the resisitivity leaving the thermopower unchanged. The doped Cu shifts the reflectivity edge to lower energies, implying that it causes a decrease of the carrier concentration and/or an increase of the effective mass. 14 refs.
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