title: Phase transformations and vibrational properties of coronene under pressure.
abstract: Both the vibrational and structural properties of coronene have been investigated upon compression up to 30.5 GPa at room temperature by a combination of Raman scattering and synchrotron x-ray diffraction measurements. The spectroscopic and crystallographic results demonstrate that two pressure-induced structural phase transitions take place at 1.5 GPa and 12.2 GPa where the high-pressure phases are identified as monoclinic and orthorhombic crystal structures with space groups of P2/m and Pmmm, respectively. A kink in the slope of the cell parameters as a function of pressure is associated with the disappearance of several internal Raman modes, which suggests the existence of structural distortions or reorganizations at approximately 6.0 GPa. Above 17.1 GPa, almost no evidence of crystallinity can be observed, indicating a possible transformation of coronene into an amorphous phase.
authors.affiliation: Department of Physics, South China University of Technology, Guangzhou 510640, China.
authors.forename: Xiao-Miao
authors.initials: XM
authors.lastname: Zhao
authors.forename: Jiang
authors.initials: J
authors.lastname: Zhang
authors.forename: Adam
authors.initials: A
authors.lastname: Berlie
authors.forename: Zhen-Xing
authors.initials: ZX
authors.lastname: Qin
authors.forename: Qiao-Wei
authors.initials: QW
authors.lastname: Huang
authors.forename: Shan
authors.initials: S
authors.lastname: Jiang
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Zhang
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Tang
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Guo-Hua
authors.initials: GH
authors.lastname: Zhong
authors.forename: Hai-Qing
authors.initials: HQ
authors.lastname: Lin
authors.forename: Xiao-Jia
authors.initials: XJ
authors.lastname: Chen