高压对苯结晶前亚稳态的影响
High pressure effects on the benzene pre-crystallization metastable states
摘要：
本文报道了苯的液-固相变的新结果。我们确定实验和调查的苯亚稳态在不同的压力下（从0.1到2200大气压）的一些参数的属性。结果表明，随着外压的增加，过冷度、压力降、孕育期、从亚稳态到晶态的突变时间和等温凝固时间均减小，在2200 atm和356 K时均消失，这可能是亚稳定的终点。给出了这些参数的二次插值公式。计算了不同压力下过冷苯的密度和摩尔热容。
英文摘要：
We report new results on the liquid to solid phase transition of benzene. We determine experimentally and investigate the properties of a number of parameters of the benzene metastable state under different pressures (from 0.1 up to 2200 atm). It is shown that the supercooling, pressure drop, incubation period, time of abrupt transition from the metastable state to the crystalline state, and time of isothermal freezing all decrease as the external pressure increases, then they all vanish at 2200 atm and 356 K which may mark the end-point of metastability. Quadratic interpolation formulas for these parameters are provided. The densities and molar heat capacities of supercooled benzene under different pressures have been calculated too.
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