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.
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)
基金
by the Scientific and Technical Development Foundation of Jilin Province of China under Grant No 20080513.
