PHASE BAROGRAMS - PHASE-DIAGRAMS BY TOTAL PRESSURE MEASUREMENTS

The measurement of the total vapour pressure of binary, quasi-binary a nd ternary systems gives us information for the determination of the e xistence of phases, the existence range of phases and their coexistenc e and solubility ranges by the investigation of the barograms of the s ystems, too. By determination of the existence fields we obtain the de composition mechanism and the dominant gaseous species and from the te mperature function of the equilibrium constant we calculate the reacti on enthalpy and reaction entropy and from these the enthalpy of format ion and the standard entropy. The possibilities of the method are demo nstrated on the ternary system Bi/Se/O.