Abstract
Band structure calculations show that substitutional lithium in bismuth can form sharp density of states peaks close to the Fermi energy, suggesting the presence of a resonant level, whereas interstitial lithium is expected to act as a simple donor impurity. Experimentally, polycrystalline elemental bismuth samples doped with 0.3%, 0.7%, 1.5%, 3%, 14% (a eutectic composition between Bi and the tetragonal intermetallic compound BiLi), and 20% lithium were prepared. Single-crystal and polycrystalline Bi88Sb12 samples were also doped with lithium. The thermal and thermoelectric transport data of those compounds are reported. The data are consistent with lithium being a donor, leading to the conclusion that it is an interstitial impurity. The thermal conductivity of Bi decreases with Li content at low concentrations, but that of the Bi/BiLi eutectic composition shows the highest value.
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Orovets, C.M., Chamoire, A.M., Jin, H. et al. Lithium as an Interstitial Donor in Bismuth and Bismuth–Antimony Alloys. J. Electron. Mater. 41, 1648–1652 (2012). https://doi.org/10.1007/s11664-011-1861-0
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DOI: https://doi.org/10.1007/s11664-011-1861-0