Reference : A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/91323
A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
English
Beekman, M. [Department of Physics, University of South Florida, Tampa, FL 33620, USA > > > >]
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Möchel, Anne mailto [Université de Liège - ULg > > > 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 > > > >]
2010
Journal of Physics : Condensed Matter
Yes (verified by ORBi)
International
0953-8984
1361-648X
[en] ATOMIC DISPLACEMENT PARAMETERS ; LATTICE THERMAL-CONDUCTIVITY ; GE; SI ; SEMICONDUCTORS ; DIFFRACTION ; MOBILITY ; PEIERLS
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/91323
10.1088/0953-8984/22/35/355401

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