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高压下正戊烷的稳定性研究

DOI: 10.11858/gywlxb.2005.04.016, PP. 371-376

Keywords: 碳硅石压腔,Raman散射光谱,正戊烷,高压,过压凝固,相变,平衡凝固

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Abstract:

利用Raman散射光谱在碳硅石压腔下研究了常温下的正戊烷从0.07~4.77GPa的稳定性。结果表明:正戊烷的CH3、CH2对称和反对称伸缩振动2877cm-1、2964cm-1和2856cm-1、2935cm-1以及-(CH2)n-同步扭曲振动1303cm-1均随压力增大而基本呈线性向高频方向移动,并在2.47GPa附近发生过压凝固,这是一种平衡稳定态之外的亚稳态现象。另外推测正戊烷在高压下可能发生固-固相变,最后通过平衡的固液共存相确定了正戊烷的平衡凝固压力为(1.90±0.05)GPa。

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