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Pressure-induced Phase Transition in Oleic Acid Studied by Raman Spectroscopy |
| FAN Ya1,2, ZHOU Jing1, LI Shuang2, GUAN Fu-Ying3, XU Da-Peng1**
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1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012
2Department of Physics, Changchun University of Science and Technology, Changchun 130022
3Library, Beijing Normal University, Beijing 100875
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| Cite this article: |
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FAN Ya, ZHOU Jing, LI Shuang et al 2011 Chin. Phys. Lett. 28 110702 |
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Abstract High-pressure Raman studies up to 0.84 GPa are performed on oleic acid. Spectral analysis indicates that oleic acid undergoes a pressure-induced phase transition in the 0.29–0.36 GPa range. Only one high-pressure phase below 0.84 GPa is present, in which the polymethylene chains take the ordered all-trans conformation, with the methyl end of the chains exhibiting the ordered tt chain−end conformation and the olefin group taking the skew-cis−skew' conformation. The conformational characters of the oleic acid molecule show that the high-pressure phase is the same as the low-temperature crystalline γ phase. The pressure-induced phase transition is typical of first-order transitions and the transition path during compression is different from that during cooling.
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| Keywords:
07.35.+k
78.30.-j
61.50.Ks
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Received: 14 July 2011
Published: 30 October 2011
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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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