Pressure-induced PhaseTransition in OleicAcid Studied by Raman Spectroscopy  

作　　者：FAN Ya ZHOU Jing LI Shuang GUAN Fu-Ying XU Da-Peng 范雅;周静;李霜;关富英;许大鹏(State Key Laboratory of Superhard Materials,Jilin University,Changchun 130012;Department of Physics,Changchun University of Science and Technology,Changchun 130022;Library,Beijing Normal University,Beijing 100875)

机构地区：[1]State Key Laboratory of Superhard Materials,Jilin University,Changchun 130012 [2]Department of Physics,Changchun University of Science and Technology,Changchun 130022 [3]Library,Beijing Normal University,Beijing 100875

出　　处：《Chinese Physics Letters》2011年第11期60-63,共4页中国物理快报（英文版）

基　　金：by the Scientific and Technical Development Foundation of Jilin Province of China under Grant No 20080513.

摘　　要：High-pressure Raman studies up to 0.84GPa are performed on oleic acid.Spectral analysis indicates that oleic acid undergoes a pressure-induced phase transition in the 0.29–0.36GPa range.Only one high-pressure phase below 0.84GPa is present,in which the polymethylene chains take the ordered all-trans conformation,with the methyl end of the chains exhibiting the ordered 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 crystalline𝛾phase.The pressure-induced phase transition is typical of first-order transitions and the transition path during compression is different from that during cooling.

关 键 词：phase CHAINS ORDERED 

分 类 号：O62[理学—有机化学]