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Magnéli oxides as promising n-type thermoelectrics

Gregor Kieslich Wolfgang Tremel

*Corresponding author: Gregor Kieslich, Wolfgang Tremel gk354@cam.ac.uk;tremel@uni-mainz.de

Materials2014,4,184doi:10.3934/matersci.2014.4.184

The discovery of a large thermopower in cobalt oxides in 1997 lead to a surge of interest in oxides for thermoelectric application. Whereas conversion efficiencies of p-type oxides can compete with non-oxide materials, n-type oxides show significantly lower thermoelectric performances. In this context so-called Magnéli oxides have recently gained attention as promising n-type thermoelectrics. A combination of crystallographic shear and intrinsic disorder lead to relatively low thermal conductivities and metallic-like electrical conductivities in Magnéli oxides. Current peak-zT values of 0.3 around 1100 K for titanium and tungsten Magnéli oxides are encouraging for future research. Here, we put Magnéli oxides into context of n-type oxide thermoelectrics and give a perspective where future research can bring us.

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