PT and VT phase diagrams of cyclic hydrocarbons, namely benzene (C6H6), cyclopentane (C5H10), thiophene (C4H4S), and tetrahydrofuran (C4H8O), were constructed using both literature and our experimental data obtained during the study of isochoric thermal conductivity in high-temperature phase. The VT phase diagrams of cyclohexane (C6H12) and furan (C4H4O), presented earlier, were refined and supplemented with PT diagrams. The possibility of constructing a phase diagram for cyclohexene (C6H10) is also discussed. The changes in molar volume during melting and the boundaries of the existence of high-temperature phases have been determined. The magnitudes of thermal pressure of cyclic hydrocarbons studied were obtained. Experimental values of dPm/dT on melting line were compared with those calculated by the Clapeyron-Clausius equation.

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