Phase V–T diagrams of fluorinated ethanes

Abstract

Phase V–T diagrams of freons of the ethane series R152a (CH₃-CHF₂), R134a (CF₃-CH₂F), and hexafluoroethane (C₂F₆) were constructed using both literature and our own experimental data. The ethane V–T phase diagram was presented earlier. The jumps in the molar volume during melting and the boundaries of the existence of dynamically orientationally disordered phases have been determined. The V–T phase diagrams of freons of the ethane series turned out to be similar in type, with the exception of ethane, which has three phases near melting.