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 language | English (US) |
|---|---|
| Pages (from-to) | 8970-8973 |
| Number of pages | 4 |
| Journal | Journal of Applied Physics |
| Volume | 91 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jun 1 2002 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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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 journal › Article
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TY - JOUR
T1 - Temperature dependent structural and transport properties of the type II clathrates A 8Na 16E 136 (A=Cs or Rb and E=Ge or Si)
AU - Nolas, G. S.
AU - Vanderveer, D. G.
AU - Wilkinson, A. P.
AU - Cohn, Joshua
PY - 2002/6/1
Y1 - 2002/6/1
N2 - 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.
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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U2 - 10.1063/1.1471370
DO - 10.1063/1.1471370
M3 - Article
AN - SCOPUS:0036607455
VL - 91
SP - 8970
EP - 8973
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 11
ER -