Temperature dependent structural and transport properties of the type II clathrates A 8Na 16E 136 (A=Cs or Rb and E=Ge or Si)

G. S. Nolas, D. G. Vanderveer, A. P. Wilkinson, Joshua Cohn

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72 Citations (Scopus)

Abstract

Variable temperature single-crystal structure analyses for Cs 8Na 16Si 136, Rb 8Na 16Si 136, Cs 8Na 16Ge 136, and Rb 8Na 16Ge 136 are reported along with electrical and thermal transport measurements on two polycrystalline specimens. The strong temperature dependence of the atomic displacement parameters for the alkali-metal atoms is indicative of significant disorder associated with the "rattling" alkali-metal atoms inside the two different polyhedra (sixteen dodecahedra and eight hexakaidecahedra per cubic unit cell) that makeup the type II clathrate hydrate framework. This disorder can lead to low lattice thermal conductivities. Transport measurements show these compounds to be metallic. The potential of type II clathrates for thermoelectric applications is discussed.

Original languageEnglish (US)
Pages (from-to)8970-8973
Number of pages4
JournalJournal of Applied Physics
Volume91
Issue number11
DOIs
StatePublished - Jun 1 2002

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clathrates
alkali metals
transport properties
disorders
polyhedrons
hydrates
atoms
thermal conductivity
temperature dependence
crystal structure
temperature
single crystals
cells

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Temperature dependent structural and transport properties of the type II clathrates A 8Na 16E 136 (A=Cs or Rb and E=Ge or Si). / Nolas, G. S.; Vanderveer, D. G.; Wilkinson, A. P.; Cohn, Joshua.

In: Journal of Applied Physics, Vol. 91, No. 11, 01.06.2002, p. 8970-8973.

Research output: Contribution to journalArticle

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AB - Variable temperature single-crystal structure analyses for Cs 8Na 16Si 136, Rb 8Na 16Si 136, Cs 8Na 16Ge 136, and Rb 8Na 16Ge 136 are reported along with electrical and thermal transport measurements on two polycrystalline specimens. The strong temperature dependence of the atomic displacement parameters for the alkali-metal atoms is indicative of significant disorder associated with the "rattling" alkali-metal atoms inside the two different polyhedra (sixteen dodecahedra and eight hexakaidecahedra per cubic unit cell) that makeup the type II clathrate hydrate framework. This disorder can lead to low lattice thermal conductivities. Transport measurements show these compounds to be metallic. The potential of type II clathrates for thermoelectric applications is discussed.

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