Electrical conductance of ionic liquids with water contents in the range 0-80 mole%

1970 ◽  
Vol 23 (5) ◽  
pp. 929 ◽  
Author(s):  
CA Angell
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Salt Water ◽  
Electrical Conductance ◽  
Specific Conductance ◽  
Eutectic System ◽  
Characteristic Behaviour ◽  
Water Contents ◽  
The Ideal

Measurements of electrical conductance and density in a ternary alkali Nitrate + nitrite eutectic system with water contents from 0 up to 82 mole % have been determined over a temperature range determined by ebullition at the upper limit and crystallization at the lower. The results, which are believed representative for salt-water systems, have been interpreted according to equations containing the "ideal glass" transition temperature as a key parameter, and the dependence on water content of this and other parameters in the equations has been assessed. The composition of the specific conductance maximum has been interpreted in terms of characteristic behaviour of the "ideal glass" transition temperature in aqueous solutions at 4-6N concentrations.

Glass-forming ability of Pr–(Cu,Ni)–Al alloys in eutectic system

2003 ◽  
Vol 18 (3) ◽  
pp. 664-671 ◽  
Author(s):  
Y. Zhang ◽  
H. Tan ◽  
H. Z. Kong ◽  
B. Yao ◽  
Y. Li
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Eutectic Composition ◽  
Solidus Temperature ◽  
Eutectic Point ◽  
Glass Forming Ability ◽  
Al Alloys ◽  
Eutectic System ◽  
Glass Forming

A eutectic point in Pr-rich Pr-(Cu,Ni)-Al alloys was experimentally determined by measuring the solidus temperature (Tm) and liquidus temperature (T1). It was found that Pr68(Cu0.5Ni0.5)25Al7 (at.%) is at the eutectic composition in the pseudoternary Pr–(Cu0.5Ni0.5)–Al alloys. The alloy Pr68(Cu0.5Ni0.5)25Al7 exhibits better glass-forming ability (GFA) than the ternary eutectic alloy Pr68Cu25Al7. However, the best GFA was obtained at an off-eutectic composition (Pr54[Cu0.5Ni0.5]30Al16) in the Pr–(Cu0.5Ni0.5)–Al alloys, which can be formed in fully amorphous rods with diameter of 1.5 mm by copper mold casting. Moreover, the glass-transition temperature Tg increases quickly (from 367 to 522 K) with the increasing of the Al content (from 3 to 27 at.%). The deviation of the best GFA composition from the eutectic point [Pr68(Cu0.5Ni0.5)25Al7] was explained in terms of the asymmetric coupled eutectic zone, the competition between growth of crystalline phase and formation of amorphous, and the higher glass-transition temperature Tg on the hypereutectic side.

scholarly journals Predicting the Thermodynamic Ideal Glass Transition Temperature in Glass-Forming Liquids

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2151
Author(s):  
Qian Gao ◽  
Zengyun Jian
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Supercooled Liquid ◽  
Coefficient Of Determination ◽  
Kauzmann Temperature ◽  
Glass Forming ◽  
Best Fitting ◽  
Fitting Parameters ◽  
The Ideal

The Kauzmann temperature TK is a lower limit of glass transition temperature, and is known as the ideal thermodynamic glass transition temperature. A supercooled liquid will condense into glass before TK. Studying the ideal glass transition temperature is beneficial to understanding the essence of glass transition in glass-forming liquids. The Kauzmann temperature TK values are predicted in 38 kinds of glass-forming liquids. In order to acquire the accurate predicted TK by using a new deduced equation, we obtained the best fitting parameters of the deduced equation with the high coefficient of determination (R2 = 0.966). In addition, the coefficients of two reported relations are replaced by the best fitting parameters to obtain the accurate predicted TK, which makes the R2 values increase from 0.685 and 0.861 to 0.970 and 0.969, respectively. Three relations with the best fitting parameters are applied to obtain the accurate predicted TK values.

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