Article (Scientific journals)
A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
Beekman, M.; Hermann, Raphaël; Möchel, Anne et al.
2010In Journal of Physics: Condensed Matter
Peer Reviewed verified by ORBi
 

Files


Full Text
NaSi.pdf
Publisher postprint (343.42 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
ATOMIC DISPLACEMENT PARAMETERS; LATTICE THERMAL-CONDUCTIVITY; GE; SI; SEMICONDUCTORS; DIFFRACTION; MOBILITY; PEIERLS
Abstract :
[en] Single-crystal x-ray diffraction from clathrate-II NaxSi136 (x = 24) prepared by a new technique reveals the exceptionally large Na@Si-28 atomic displacement parameter (U-eq) is strongly temperature dependent, and can be attributed to low-energy rattling modes associated with the Na guest. Inelastic neutron scattering (INS) spectra collected from NaxSi136 powder specimens (x = 3, 23) confirm the presence of low-energy guest-derived phonon modes for Na@Si-28 and Na@Si-20. The lower energy Na@Si-28 rattler mode falls in the frequency range of the silicon host acoustic phonons, indicating the possibility for interaction with these phonons. The presence of these low-energy modes combined with the ability to controllably vary the guest content presents a unique opportunity for exploring the influence of guest-framework interactions on the lattice dynamics in intermetallic clathrates.
Disciplines :
Physics
Author, co-author :
Beekman, M.;  Department of Physics, University of South Florida, Tampa, FL 33620, USA
Hermann, Raphaël ;  Université de Liège - ULiège > Département de physique > Département de physique
Möchel, Anne ;  Université de Liège - ULiège > Doct. sc. (chimie - Bologne)
Juranyi, F.;  Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut
Nolas, G. S.;  Department of Physics, University of South Florida
Language :
English
Title :
A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
Publication date :
2010
Journal title :
Journal of Physics: Condensed Matter
ISSN :
0953-8984
eISSN :
1361-648X
Publisher :
Institute of Physics Publishing, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 May 2011

Statistics


Number of views
55 (2 by ULiège)
Number of downloads
1961 (1 by ULiège)

Scopus citations®
 
17
Scopus citations®
without self-citations
9
OpenCitations
 
12

Bibliography


Similar publications



Contact ORBi