Abstract
A low temperature, solid state synthesis technique has enabled the production of homogeneous samples of La3−x−yYbyTe4. This allows the substitution of divalent Yb to be utilized to optimize the thermoelectric performance in lanthanum telluride. The addition of Yb2+ changes the electrical transport properties in a manner that can be well understood using valence counting rules and a corresponding change in the Fermi energy. The substitution of Yb2+ for La3+ results in a threefold finer control over the carrier density n, thus allowing the optimum n ∼ 0.3 × 1021 cm−3 to be both predicted and prepared. The net result is an improvement in thermoelectric efficiency, with zT reaching ∼1.2 at 1273 K.
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