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    Thiel, Philipp Eilertsen, James Populoh, Sascha Saucke, Gesine Döbeli, Max Shkabko, Andrey Sagarna, Leyre Karvonen, Lassi and Weidenkaff, Anke 2013. Influence of tungsten substitution and oxygen deficiency on the thermoelectric properties of CaMnO3−δ. Journal of Applied Physics, Vol. 114, Issue. 24, p. 243707.


High-temperature thermoelectric properties of W-substituted CaMnO3


The thermoelectric properties of W-substituted CaMn1-xWxO3-δ (x = 0.01, 0.03; 0.05) samples, prepared by soft chemistry, were investigated from 300 K to 1000 K and compared to Nb-substituted CaMn0.98Nb0.02O3-δ. All compositions exhibit both an increase in absolute Seebeck coefficient and electrical resistivity with temperature. Moreover, compared to the Nb-substituted sample, the thermal conductivity of the W-substituted samples was strongly reduced. This reduction is attributed to the nearly two times greater mass of tungsten. Consequently, a ZT of 0.19 was found in CaMn0.97W0.03O3-δ at 1000 K, which was larger than ZT exhibited by the 2% Nb-doped sample.

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