High-pressure Raman study of the iodine-doped silicon clathrate I8Si44I2
Physical Review B - Condensed Matter and Materials Physics 68 巻 21 号
2121021- 頁
2003-12 発行
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タイトル ( eng ) |
High-pressure Raman study of the iodine-doped silicon clathrate I8Si44I2
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作成者 |
Shimizu Hiroyasu
Kume Tetsuji
Kubota Toyoki
Sasaki Shingo
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収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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巻 | 68 |
号 | 21 |
開始ページ | 2121021 |
抄録 |
Raman scattering measurements of an iodine-doped I8Si44I2 clathrate have been performed at pressures up to 28 GPa and 296 K. We found two Raman peaks at 75 and 101 cm-1 associated with the vibrations of guest I atoms inside the host Si cages, and observed some framework vibrations around 120–500 cm-1. These characteristic Raman bands and their pressure dependence are investigated in consideration of our recent Ba8Si46 studies. The lowest-frequency framework vibration at 133 cm-1 shows the softening with pressure, which seems to be the common feature of Si clathrates. A strong and broad Raman band centered at 461 cm-1 is identified to the highest-frequency framework vibration, which is likely intensified and broadened by the considerable framework distortion due to the replacement of framework Si with larger I atom. No obvious pressure-induced phase transition was found up to 28 GPa. The guest-host interactions are investigated by the present vibrational properties and are compared with those of previous neutron studies of I8Si44I2.
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NDC分類 |
物理学 [ 420 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
American Physical Society
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発行日 | 2003-12 |
権利情報 |
Copyright (c) 2003 American Physical Society
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出版タイプ | Version of Record(出版社版。早期公開を含む) |
アクセス権 | オープンアクセス |
収録物識別子 |
[NCID] AA11187113
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.68.212102
[DOI] http://dx.doi.org/10.1103/PhysRevB.68.212102
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