In the present paper, according to the data of the constructed phase diagram of ice in P-T coordinates and the experimental value of the volume change at equilibrium transitions, the values of the changes in the characteristic thermodynamic function occurring at these transitions are estimated. The tangents of the inclination angle of the two-phase equilibrium lines of the existing phases are determined. The investigation of the phase diagram in P-T coordinates of various polymorphic ice modifications at high pressures and low temperatures under non-equilibrium conditions is of considerable scientific and practical interest. The all-round compression module is an important mechanical and, at the same time, energy characteristic of a solid body. According to the experimental measurements, it is possible to calculate the compressibility of the studied ice modifications and their comprehensive compression modules at different temperatures and pressures. The values of all-round compression coefficients allow theoretical calculation of ultrasonic wave propagation velocities depending on pressure and temperature to determine the dependencies of elastic characteristics, compressibility, and Debayev temperature and to calculate the change of a number of thermodynamic values. In the present paper, the data of the constructed phase diagram of ice and experimental values of volumetric changes in equilibrium transitions are used to estimate the values of changes in the characteristic function occurring during these transitions. The tangents of the inclination angle of the two-phase equilibrium lines are determined. In the article, the changes of thermodynamic characteristic functions of the phase transition are estimated and the slope of the two-phase equilibrium line is calculated.
Volume 11 | Issue 6