МҰЗДЫҢ ФАЗАЛЫҚ ДИАГРАММАСЫН ФИЗИКАХИМИЯЛЫҚ ТАЛДАУЛАРДЫ ҚОЛДАНЫП ЗЕРТТЕУ

Abstract

The article provides a physico-chemical analysis of the ice phase diagram in P-T coordinates at high (0-2500) MPa pressure and low (90-250) K temperature. In order to study the phase diagram of ice at a pressure of 2500 MPa and a temperature from 90 K to a temperature of 250 K, the design of a high-pressure piston-cylindrical chamber was calculated. In order to increase the strength of the chamber, the cylinders that had undergone heat treatment of three concentric layers were heated and forced to overlap each other. The pressure in the ice under study was determined by measuring the electrical resistance of tin and gallium (Ga) located inside (Sn). Using a copper-constantane thermosystem located in the sample, we controlled its temperature. To measure the volume change in phase transformations, we used a special converter, which converts linear displacement into electrical pulses. Carrying out physicochemical analyses of the phase diagram, taking into account the change in specific volume during phase transformation, allows us to determine the tangent of the angle of equilibrium inclination of the two phases with changes in entropy (∆S), enthalpy (∆J), internal energy (∆W).