正辛烷的高压拉曼光谱研究

武晓鑫; 李敏; 李芳菲; 周强; 高伟; 崔启良; 邹广田

doi:10.11858/gywlxb.2009.04.011

正辛烷的高压拉曼光谱研究

doi: 10.11858/gywlxb.2009.04.011

1.
吉林大学材料科学与工程学院，吉林长春 130020；
2.
吉林大学超硬材料国家重点实验室，吉林长春 130012

详细信息

通讯作者:
高伟

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出版历程
- 收稿日期: 2009-04-15
- 修回日期: 2009-05-26
- 发布日期: 2009-08-15

Raman Scattering Studies of n-Octane under High Pressure

1.
School of Materals Science and Engineering, Jilin University, Changchun 130020, China;
2.
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

More Information

Corresponding author: GAO Wei

摘要

摘要: 采用金刚石对顶砧高压装置，在室温下对正辛烷（C8H18）进行了原位高压拉曼光谱研究，实验的最高压力为13GPa。在实验的压力范围内，正辛烷的拉曼峰位随压力的升高均向高频移动，峰强逐渐减弱，峰形变宽。常态为液态的正辛烷在0.8 GPa时，拉曼频移随压力的变化曲线出现了拐点，发生了液－固相变；在6.8 GPa时，伴随着原拉曼峰的消失或劈裂，以及新拉曼峰的出现，此时正辛烷可能发生了固－固相变。该相变压力低于已有的低碳数正烃烷的压致相变结果。正烃烷的压致相变压力点，具有随着结构链长的增加，其相变压力降低的规律。
- 正辛烷 /
- Raman光谱 /
- 高压 /
- 相变 /
- 金刚石对顶砧
Abstract: High pressure Raman spectra of n-octane were investigated by diamond anvil cell (DAC) at pressure up to 7 GPa and ambient temperature. The result shows that the liquid-solid phase transition of n-octane takes place around 0.8 GPa. Within the experimental pressure range, the Raman shift of n-octane moves to higher frequency, while the peak intensity decreases, and the width of peaks broaden with increasing pressure. A turning point is observed in the curve of pressure-dependent Raman shift when the pressure increases up to 6.8 GPa. This result indicates that a solid-solid phase transition for n-octane has been finished at this pressure. The pressure-induced phase transition pressure in alkanes decreases with the length of their chains increasing.
- n-Octane /
- Raman spectra /
- high pressure /
- phase transition /
- diamond anvil cell (DAC)

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参考文献(13)

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