单次运行确定经历连续固-固和固-液相变物质的饱和蒸汽压及汽化/升华焓：以N-甲基乙酰胺为例
Single-run determination of the saturation vapor pressure and enthalpy of vaporization/sublimation of a substance undergoing successive solid-solid and solid-liquid phase transitions: the case of $N$-methyl acetamide
AI总结：
本研究通过单次运行测量N-甲基乙酰胺在不同温度下的饱和蒸汽压及相变焓，揭示其固-固和固-液相变过程中的热力学特性。
摘要：
我们报告了对N-甲基乙酰胺在-30°C至34°C温度范围内饱和蒸汽压的动态测量。这通过监测真空腔内预冷却样品缓慢热平衡到腔体温度时所经历的相变过程来实现，首先在约1°C处经历两种结晶结构之间的相变，随后在约30°C处经历固-液相变。此类测量可在一次运行中提供精确的饱和蒸汽压及不同相的升华焓和汽化焓数据。
英文摘要：
We report on the dynamical measurement of the saturation vapor pressure of $N$-methyl acetamide in the temperature range $-30^\circ$C to $34^\circ$C. This is achieved by monitoring the pressure inside a vacuum chamber in which a precooled sample of the substance slowly thermalizes to the chamber temperature, undergoing first a phase transition between two crystalline structures around $1^\circ$C and then a solid-liquid phase transition around $30^\circ$C. Such a measurement provides in a single run accurate data for the saturation vapor pressure and the enthalpies of sublimation and vaporization of the different phases of the investigated substance.
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