Calculation method of R1234yf phase equilibrium curve within temperature range from 122.6 K to 367.85 K

2020 ◽  
Author(s):  
S. V. Rykov ◽  
I. V. Kudriavtseva ◽  
A. V. Sverdlov ◽  
V. A. Rykov
Keyword(s):  
Phase Equilibrium ◽  
Calculation Method ◽  
Equilibrium Curve ◽  
Temperature Range ◽  
Phase Equilibrium Curve

scholarly journals Supercritical behavior of thermodynamic systems

2019 ◽  
Vol 27 (1) ◽  
pp. 19-26
Author(s):  
A. N. Galdina
Keyword(s):  
Phase Transitions ◽  
Phase Equilibrium ◽  
Limit Point ◽  
Thermodynamic System ◽  
Continuous Phase ◽  
Stability Conditions ◽  
Equilibrium Curve ◽  
Limit Case ◽  
Phase Equilibrium Curve ◽  
Thermodynamic Forces

It is known that basic stability characteristics of a system are inversely proportional to fluctuations of external parameters. Above the critical point there is a region remaining homogeneous macroscopically, but becoming microheterogeneous within an interval of thermodynamic forces. Within this interval thermodynamic coefficients of stability pass finite non-zero minima. This corresponds to the considerable growth of fluctuations and indicates the occurrence of supercritical transition of continuous kind. The limit case of such continuous phase transitions is the critical state, which is also the limit point of some first-kind transitions (the limit point of phase equilibrium curve).In this paper we consider the relation between thermodynamic stability conditions and fluctuations of external parameters of the system. We study the behavior of a simple one-component thermodynamic system (liquid, magnet, and ferroelectric) in the supercritical region and derive the equation of the line of supercritical transition for this system.

Subsolidus solubility between : a hydrothermal investigation

1966 ◽  
Vol 35 (273) ◽  
pp. 742-755 ◽  
Author(s):  
R. S. Bradley ◽  
P. Engel ◽  
D. C. Munro
Keyword(s):  
Phase Equilibrium ◽  
Solid Solutions ◽  
Kinetic Properties ◽  
Subsolidus Phase ◽  
Temperature Range ◽  
Subsolidus Phase Equilibrium ◽  
Geological Factors ◽  
Preliminary Study ◽  
Experimental Findings

SummaryThe subsolidus phase equilibrium of the lithiophilite-tephroite system was studied in the temperature range 500 to 900° C. The solubility of tephroite in lithiophilite is limited and increases with temperature. The reaction is very sluggish and has peculiar kinetic properties. No reverse solubility was observed. Similar asymmetry was found in the LiMgPO4-forsterite system of which a preliminary study was made. Apparent absences of silicate phosphate olivine solid solutions in nature are related to our experimental findings and to geological factors.

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