The dynamics of the guests in filled germanium clathrates

Hermann, Raphaël; Grandjean, Fernande; Keppens, V.; Schweika, W.; Nolas, G. S.; Mandrus, D. G.; Sales, B. C.; Christen, H. M.; Bonville, P.; Long, Gary J; Hogan, T. P.; Funahashi, R.

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The dynamics of the guests in filled germanium clathrates

Hermann, Raphaël; Grandjean, Fernande; Keppens, V. et al.

2006 • In Mater. Res. Soc. Symp. Proc. Vol. 886

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Abstract :

[en] In the filled gallium-germanium clathrates, R8Ga16Ge30, where R is Ba, Sr, or Eu, the guests are located in two large cages and are weakly bound to the crystalline clathrate framework. The caged guests exhibit a localized "rattling" vibrational mode that provides an efficient mechanism for reducing the thermal conductivity. Inelastic neutron scattering and nuclear inelastic scattering measurements have yielded the phonon density of states in R8Ga16Ge30; the line width of the localized vibrational modes is found to be an important parameter in determining the lattice thermal conductivity. Neutron diffraction studies on R8Ga16Ge30 have shown that the guests in the larger cage are located off-center, and it was proposed that their jumping about the four off-center locations is responsible for the observed glass-like thermal conductivity at temperatures below 10 K. The detection of such slow guest motion is challenging because the typical time and energy scales involved are ca. 4 ns and 1 mu eV, respectively. We have studied the slow europium tunneling dynamics in Eu4Sr4Ga16Ge30 by both Mossbauer and microwave absorption spectroscopy.

Disciplines :

Materials science & engineering
Electrical & electronics engineering
Physics

Author, co-author :

Hermann, Raphaël ; Université de Liège - ULiège > Département de physique > Département de physique

Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique

Keppens, V.

Schweika, W.

Nolas, G. S.

Mandrus, D. G.

Sales, B. C.

Christen, H. M.

Bonville, P.

Long, Gary J

Hogan, T. P.

Funahashi, R.

Language :

English

Title :

The dynamics of the guests in filled germanium clathrates

Publication date :

2006

Event name :

MRS 2005 Fall Meeting

Event date :

November 2005

Main work title :

Mater. Res. Soc. Symp. Proc. Vol. 886

Publisher :

Materials Research Society

Pages :

389-394

Peer reviewed :

Peer reviewed

Available on ORBi :

since 13 December 2012

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