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Phase Transition in CCl4 under Pressure: a Raman Spectroscopic Study |
LIU Tie-Cheng, ZHOU Mi, GAO Shu-Qin, LI Zuo-Wei, LI Zhan-Long, ZHANG
Peng, LI Liang, LV Tian-Quan, XU Da-Peng |
| College of Physics, Jilin University, Changchun 130023 |
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| Cite this article: |
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LIU Tie-Cheng, ZHOU Mi, GAO Shu-Qin et al 2009 Chin. Phys. Lett. 26 070701 |
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Abstract High-pressure Raman studies at room temperature are performed on CCl4 up to 13GPa. The Raman bands of the internal modes (v2, v4 and v1) show entirely positive pressure dependence. The slopes dω/dP of the internal modes exhibit two sudden changes at 0.73GPa and 7.13GPa, respectively. A new lower frequency mode (225cm-1) appears at 3.03GPa, and the splitting of v2, ν3 and v4 occurs at about 7.13GPa. Moreover, Raman spectra of Fermi
resonance show that the relative position of the v1 + v4 combination and the ν3 fundamental firstly interchanges corresponding to that at ambient pressure, then the v1 +v4 combination disappears in the gradual process of compression. It is indicated that the pressure-induced phase transition from CCl4 II to CCl4 III occurs at 0.73GPa, and CCl4 III undergoes a transition to CCl4 IV below 3.03GPa. Further CCl4 IV transforms in a new high-pressure phase at about 7.13GPa, and the symmetry of the new high-pressure phase is lower than that of CCl4 IV. All the transitions are reversible during decompression.
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| Keywords:
07.35.+k
78.30.-j
61.50.Ks
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Received: 17 March 2009
Published: 02 July 2009
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| PACS: |
07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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78.30.-j
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(Infrared and Raman spectra)
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61.50.Ks
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(Crystallographic aspects of phase transformations; pressure effects)
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