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ID 16634
file
creator
Shimizu, Hiroyasu
Kume, Tetsuji
Kuroda, Toyoki
Sasaki, Shigeo
NDC
Physics
abstract
High-pressure Raman scattering of type-III silicon clathrate Ba 24Si100 has been measured up to 27 GPa at room temperature. Low-frequency vibrational modes associated with Ba atoms inside three kinds of cages were found around 45-90 cm-1. The Si framework Raman bands were observed around 115-415 cm-1, which are altogether shifted toward lower frequencies as compared to those of type-I Ba 8Si46. High-pressure phase transition occurs at 6.5 GPa, which seems to be due to the structural distortion induced by the increasing guest(Ba)-host(Si) couplings. Ba24Si100 becomes irreversibly amorphous above 23 GPa. This pressure is lower than those of type-I Si clathrates, which suggests that type-III structure is less stable than type-I under high pressures.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 71
issue
Issue 9
start page
094108
date of issued
2005-03-01
publisher
American Physical Society
issn
1098-0121
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 American Physical Society
relation url
department
Graduate School of Engineering