Abstract
The thermal conductivity of polycrystalline semiconductors with type-I clathrate hydrate crystal structure is reported. Ge clathrates (doped with Sr and/or Eu) exhibit lattice thermal conductivities typical of amorphous materials. Remarkably, this behavior occurs in spite of the well-defined crystalline structure and relatively high electron mobility (˜100cm2/Vs). The dynamics of dopant ions and their interaction with the polyhedral cages of the structure are a likely source of the strong phonon scattering.
Original language | English (US) |
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Pages (from-to) | 779-782 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 82 |
Issue number | 4 |
DOIs | |
State | Published - 1999 |
ASJC Scopus subject areas
- Physics and Astronomy(all)