Transport properties of polycrystalline type-I Sn clathrates

G. S. Nolas, J. L. Cohn, J. S. Dyck, C. Uher, J. Yang

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

Thermal conductivity, resistivity, Seebeck coefficient, and Hall measurements on polycrystalline Sn-clathrate compounds with the type-I hydrate crystal structure are reported. Interstitial alkali-metal atoms in these compounds reside inside polyhedral cavities formed by the tetrahedrally bonded Sn network atoms. Localized disorder associated with "rattling" motion of these interstitial atoms contributes to the low thermal conductivity of these semiconducting compounds. The Hall coefficient and resistivity for some compounds exhibit nonmonotonic temperature dependences consistent with a crossover with decreasing temperature from conduction-band to impurity-band conduction. The carrier mobility is found to be low even in the absence of interstitial atoms within the Sn framework, suggesting a large effective mass and/or scattering rate. We discuss the properties in the context of potential thermoelectric applications.

Original languageEnglish (US)
Article number165201
Pages (from-to)1652011-1652016
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number16
DOIs
StatePublished - Apr 15 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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