High-pressure study of isoviolanthrone by Raman spectroscopy.

High-pressure study of isoviolanthrone by Raman spectroscopy.
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拉曼光谱对异紫蒽酮的高压研究。

DOI:
10.1063/1.4885142
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发表时间:
2014-06
影响因子:
4.4
通讯作者:
Xiao-Jia Chen
Xiao-Jia Chen
中科院分区:
化学2区
文献类型:
--
作者:
Jiang Zhang;Guo-Hua Zhong;Hai-Qing Lin;Xiao-Jia Chen

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用拉曼散射法研究了等紫王座在压力高达30.5 GPa和室温下的振动特性。给出了这种材料在压力下声子谱的完整表征。从频移和内模和内模全宽半最大值的变化可以看出,在11.0 GPa时相变开始,在13.8 GPa以上相变形成。这种转变是由分子内键和分子间键的变化引起的。在室温下,强度比随压力的变化趋势与电阻的压力依赖性很好地吻合,表明相变可能是由电子引起的。晶格模式没有变化表明观察到的相变可能是结构扭曲或重组的结果。在研究的整个压力区,确定了压缩和减压过渡的可逆性。
Vibrational properties of isoviolanthrone are investigated by Raman scattering at pressures up to 30.5 GPa and room temperature. A complete characterization of phonon spectra under pressure is given for this material. The onset of a phase transition at 11.0 GPa and the formation of a new phase above 13.8 GPa are identified from both the frequency shifts and the changes in the full width half maxima of the intra- and internal modes. The transition is proposed to result from the changes of intra- and intermolecular bonding. The tendencies of the intensity ratios with pressure are in good agreement with the pressure dependence of the resistance at room temperature, indicating that the phase transition may be an electronic origin. The absence of the changes in the lattice modes indicates that the observed phase transition is probably a result of the structural distortions or reorganizations. The reversible character of the transition upon compression and decompression is determined in the entire pressure region studied.
DOI: 10.1107/s0365110x64002596
发表时间: 1964-08
期刊: Acta Crystallographica
影响因子: --
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