Lithium, the lightest metal element with a small ionic radius, is successfully filled into the voids of CoSb3 by utilizing the high pressure synthesis technique. The synthesized Li0.4Co4Sb12 shows the largest thermoelectric power factor of 6000 μW m−1 K−2 among all elemental filled CoSb3 materials. This significantly enhanced thermoelectric power factor is attributed to the large carrier mobility of Li0.4Co4Sb12, 61 cm2 V−1 s−1, featuring a good electron crystal property for the Li-filled CoSb3 samples.
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Zhang et al. (2011) studied this question.
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