Glass transition temperature of calcium nitrate-potassium nitrate-water system

1980 ◽  
Vol 45 (7) ◽  
pp. 1896-1902 ◽  
Author(s):  
Jarmila Malá ◽  
Ivo Sláma
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Linear Function ◽  
Calcium Nitrate ◽  
Water System ◽  
Potassium Nitrate ◽  
Concentration Region ◽  
Hydrated Calcium ◽  
Nitrate Solutions

The glass-formig concentration region of the calcium nitrate-potassium nitrate-water system was determined. The glass transition temperature can be in the studied region approximated by a linear function of the salt concentrations. A comparison of the properties of the studied system with the hydrated calcium nitrate and chloride mixture revealed important differences in the effect of different salts on the undercoolability of aqueous calcium nitrate solutions.

The temperature and concentration dependence of viscosity and the concentration dependence of glass transition temperature for the system calcium nitrate-potassium nitrate-water

1981 ◽  
Vol 46 (9) ◽  
pp. 2149-2157 ◽  
Author(s):  
Mojmír Skokánek ◽  
Jarmila Malá ◽  
Ivo Sláma
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Concentration Dependence ◽  
Mole Fraction ◽  
Potassium Salt ◽  
Calcium Nitrate ◽  
Potassium Nitrate ◽  
Empirical Equations ◽  
Temperature Range

The temperature and concentration dependence of viscosity of the system calcium nitrate-potassium nitrate-water was studied in the temperature range -20 to +75 °C for concentrations given by ionic fractions of the potassium salt of 0.1, 0.2, 0.3, 0.4, and 0.5. The mole fraction of the salts was within the range 0.047 to 0.238. The temperature and concentration dependence of viscosity has been correlated with empirical equations. An equation describing the temperature and concentration dependence of viscosity has been proposed on the basis of the variation of glass transition temperature with concentration.

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