Alkali Halides: Relationship between Heat of Fusion, Melting Point, Electronic Polarizability and the Ionic Radius Ratio

Nature ◽  
1968 ◽  
Vol 218 (5143) ◽  
pp. 765-766 ◽  
Author(s):  
HITOSHI KANNO
Keyword(s):  
Melting Point ◽  
Ionic Radius ◽  
Alkali Halides ◽  
Radius Ratio ◽  
Heat Of Fusion ◽  
Electronic Polarizability

Studies on the freezing of pure liquids I. Critical supercooling in molten alkali halides

1960 ◽  
Vol 259 (1298) ◽  
pp. 325-340 ◽  
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Melting Point ◽  
Alkali Halide ◽  
Alkali Halides ◽  
Solid Particles ◽  
High Supersaturation ◽  
Chamber Temperature ◽  
Reduced Temperature ◽  
Heater Coil

A high-temperature cloud chamber is described in which a bead of alkali halide is supported on a heater coil mounted in the roof. By passing the current through the coil the temperature of the bead may be momentarily raised by several hundred degrees, producing salt vapour at high supersaturation. Condensation ensues in the presence of the inert supporting gas, and clouds of droplets or solid particles appear depending on the chamber temperature. Light scattered from the clouds under strong illumination is examined with a telescope, and the presence of crystalline particles is detected by their capacity to scintillate, or ‘twinkle’. It is found that twinkling in clouds of alkali halides appears sharply as the temperature is lowered below the melting point, defining a critical temperature of solidification for each salt. Reasons are given for regarding this temperature as the freezing threshold of molten salt droplets, for which supercoolings of about 150 °C are indicated. A reduced temperature, given by the ratio of the freezing threshold to the melting point, has the value of approximately 0.8 for all the alkali halides examined.

Evaluation of Color Additives Using a Differential Scanning Calorimeter

1970 ◽  
Vol 53 (2) ◽  
pp. 244-249
Author(s):  
Daniel M Marmion
Keyword(s):  
Melting Point ◽  
Moisture Content ◽  
Differential Scanning Calorimeter ◽  
Relative Stability ◽  
Heat Of Fusion ◽  
Permanent Record ◽  
Natural Color ◽  
Sensitive Tool ◽  
Similar Information

Abstract DSC is a rapid and sensitive tool for the determination of the melting point, moisture content, purity, and heat of fusion of certifiable colors. The relative stability and the identification of the colorants may also be deduced from the thermograms. The procedures outlined require only a few milligrams of sample and provide a permanent record. Attempts to obtain similar information for natural color additives were unsuccessful due to the inability to obtain reproducible thermograms.

The Heat Capacity of Gallium from 15 to 320°K. The Heat of Fusion at the Melting Point

1952 ◽  
Vol 74 (19) ◽  
pp. 4784-4787 ◽  
Author(s):  
George B. Adams ◽  
Herrick L. Johnston ◽  
Eugene C. Kerr
Keyword(s):  
Heat Capacity ◽  
Melting Point ◽  
Heat Of Fusion
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