High temperature thermoelectric properties and figure-of-merit of sintered Nd2?xCexCuO4 |
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Authors: | M Yasukawa N Murayama |
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Affiliation: | (1) National Industrial Research Institute of Nagoya, Hirate-cho, Kita-ku Nagoya 462, Japan |
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Abstract: | Thermoelectric properties such as the Seebeck coefficient, electrical resistivity, and thermal conductivity are measured in
the temperature range of 300– 673 K on Nd2−xCexCuO4 (x = 0–0.1) sintered bodies in order to estimate the figure-of-merit for
thermoelectric energy conversion. The temperature dependences of both the Seebeck coefficient and electrical resistivity indicated
n-type semiconducting behaviour. The thermal conductivities whose value decreased with increasing temperature were in the
range of 3.7–7.5 Wm-1K-1. The maxima of the power factor and the figure-of-merit estimated from data measured at 320 K on
a sample of a composition of x = 0.05 were 9.2×10-5 Wm-1K-2 and 1.7×10-5 K-1, respectively. The limitation of the power factor
is discussed based on the measured Seebeck coefficient and electrical conductivity data. The thermal conductivity could be
separated into a small electron component and a large phonon component by applying the Wiedemann–Franz law. This suggests
the possibility of improving the figure-of-merit to some extent by a reduction of the phonon thermal conductivity.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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