The thermoelectric properties from 300 - 1275 K of calcium-doped LaTe are reported. LaTe is a high temperature n-type thermoelectric material with a previously reported zT ~ 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 LaTe. Doping with Ca on the La 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 zT ~ 1.2 is reached at 1273 K for the composition LaCaTe and the relative increase compared to LaTe is attributed to the finer carrier concentration.
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| http://dx.doi.org/10.1039/C5TC01648G | DOI Listing |
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