Journal of Electronic Materials

, Volume 41, Issue 6, pp 1648–1652 | Cite as

Lithium as an Interstitial Donor in Bismuth and Bismuth–Antimony Alloys

  • Christine M. Orovets
  • Audrey M. Chamoire
  • Hyungyu Jin
  • Bartlomiej Wiendlocha
  • Joseph P. Heremans
Article

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.

Keywords

Bi1−xSbx alloys lithium interstitial resonant levels thermoelectrics 

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Copyright information

© TMS 2011

Authors and Affiliations

  • Christine M. Orovets
    • 1
  • Audrey M. Chamoire
    • 1
  • Hyungyu Jin
    • 1
  • Bartlomiej Wiendlocha
    • 1
    • 2
  • Joseph P. Heremans
    • 1
    • 3
  1. 1.Department of Mechanical and Aerospace EngineeringThe Ohio State UniversityColumbusUSA
  2. 2.Faculty of Physics and Applied Computer ScienceAGH University of Science and TechnologyKrakowPoland
  3. 3.Department of PhysicsThe Ohio State UniversityColumbusUSA

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