Structural and vibrational properties of phenanthrene under pressure.
Structural and vibrational properties of phenanthrene under pressure.
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DOI：
10.1063/1.4820359
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
Qiao-Wei Huang;Jiang Zhang;A. Berlie;Zhen Qin;Xiao-Miao Zhao;Jianbo Zhang;Ling-yun Tang;Jing Liu
中科院分区：
文献类型：
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作者：
Qiao-Wei Huang;Jiang Zhang;A. Berlie;Zhen Qin;Xiao-Miao Zhao;Jianbo Zhang;Ling-yun Tang;Jing Liu
通过拉曼光谱和同步加速器X射线衍射技术，在高压最高30.2 GPA的高压下测量了该稳定的结构和振动特性。在2.3 GPa和5.4 GPa的压力下，在拉曼光谱中观察到了两个相变，这对应于分子间和分子内振动模式的显着变化。在10.2 GPA以上，所有拉曼峰在荧光背景中丢失。然而，在进一步的压缩高于20.0 GPA时，在1600、2993和3181 cm（-1）时观察到三个宽峰，表明稳态已转化为无定形相。使用X射线衍射，对于I阶段I（0-2.2 GPA）的P2（1），p2（0-2.2 GPA），P2/m的P2（1），p2/m的P2（1），P2/M M+PMMM的III期（5.6-11.4 GPA），具有结构的共存，高于11.4 GPA的结构由空间组索引PMMM。尽管菲已转化为20.0 GPA以上的氢化无定形碳结构，但这些无定形簇仍基于我们的X射线衍射模式显示出特征性的结晶行为。我们的结果表明，在高压下，远程周期性和局部障碍状态在菲人中共存。
The structural and vibrational properties of phenanthrene are measured at high pressures up to 30.2 GPa by Raman spectroscopy and synchrotron X-ray diffraction techniques. Two phase transitions are observed in the Raman spectra at pressures of 2.3 GPa and 5.4 GPa which correspond to significant changes of intermolecular and intramolecular vibrational modes. Above 10.2 GPa, all the Raman peaks are lost within the fluorescence background; however, upon further compression above 20.0 GPa, three broad peaks are observed at 1600, 2993, and 3181 cm(-1), indicating that phenanthrene has transformed into amorphous phase. Using X-ray diffraction, the structures of corresponding phases observed from Raman spectra are indexed with space groups of P2(1) for phase I (0-2.2 GPa), P2/m for phase II (2.2-5.6 GPa), P2/m+Pmmm for phase III (5.6-11.4 GPa) which has a coexistence of structures, and above 11.4 GPa the structure is indexed with space group of Pmmm. Although phenanthrene has transformed to a hydrogenated amorphous carbon structure above 20.0 GPa, these amorphous clusters still show characteristic crystalline behavior based on our X-ray diffraction patterns. Our results suggest that the long-range periodicity and the local disorder state coexist in phenanthrene at high pressures.