Fizika Nizkikh Temperatur: Volume 48, Number 7 (July 2022), p. 625-628    ( to contents , go back )

Phase V–T diagrams of fluorinated ethanes

V. A. Konstantinov, A. V. Karachevtseva, V. P. Revyakin, and V. V. Sagan

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
E-mail: konstantinov@ilt.kharkov.ua
pos Анотація:629

Received December 20, 2021, published online May 20, 2022

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.

Key words: fluorinated ethanes, melting point, Clapeyron–Clausius formula.

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