This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/22/35/35401 in citations.
A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
A study of low-energy guest phonon modes in clathrate-II NaxSi136 (x = 3, 23, and 24)
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...
Saved in:
Personal Name(s): | Beekman, M. |
---|---|
Hermann, R. / Möchel, A. / Juranyi, F. / Nolas, G. S. | |
Contributing Institute: |
JCNS; JCNS JARA-FIT; JARA-FIT Neutronenstreuung; IFF-5 Streumethoden; IFF-4 |
Published in: | Journal of physics / Condensed matter, 22 (2010) S. 355401 |
Imprint: |
Bristol
IOP Publ.
2010
|
Physical Description: |
355401 |
DOI: |
10.1088/0953-8984/22/35/35401 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
Journal of Physics: Condensed Matter
22 |
Subject (ZB): | |
Publikationsportal JuSER |
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. |