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 hexafluoro-ethane (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.