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Issue 40, 2015
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Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La3−xCaxTe4

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Abstract

The thermoelectric properties from 300–1275 K of calcium-doped La3−xTe4 are reported. La3−xTe4 is a high temperature n-type thermoelectric material with a previously reported zTmax ∼ 1.1 at 1273 K and x = 0.23. Computational modeling suggests the La atoms define the density of states of the conduction band for La3−xTe4. Doping with Ca2+ on the La3+ site is explored as a means of modifying the density of states to improve the power factor and to achieve a finer control over the carrier concentration. High purity, oxide-free samples are produced by ball milling of the elements and consolidation by spark plasma sintering. Calcium substitution upon the lanthanum site was confirmed by a combination of Rietveld refinements of powder X-ray diffraction data and wave dispersive spectroscopy. A zTmax ∼ 1.2 is reached at 1273 K for the composition La2.2Ca0.78Te4 and the relative increase compared to La3−xTe4 is attributed to the finer carrier concentration.

Graphical abstract: Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La3−xCaxTe4

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Publication details

The article was received on 04 Jun 2015, accepted on 22 Jun 2015 and first published on 31 Jul 2015


Article type: Paper
DOI: 10.1039/C5TC01648G
Citation: J. Mater. Chem. C, 2015,3, 10459-10466
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    Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La3−xCaxTe4

    J. M. Ma, S. M. Clarke, W. G. Zeier, T. Vo, P. Von Allmen, G. Jeffrey Snyder, R. B. Kaner, J. Fleurial and S. K. Bux, J. Mater. Chem. C, 2015, 3, 10459
    DOI: 10.1039/C5TC01648G

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