Izvestiya of Saratov University.

Chemistry. Biology. Ecology

ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)
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Language: 
Russian
Heading: 
Chemistry
Article type: 
Article
UDC: 
541.1+544.012+544.013
DOI: 
10.18500/1816-9775-2020-20-3-290-299

Density Calculation for Mixture Melts of LiF + NaF

Autors: 
Garkushin Ivan K., Samara State Technical University
Lavrenteva Olga V., Samara State Technical University
Nikitina Alina S., Samara State Technical University
Andreeva Yana A., Samara State Technical University
Abstract: 

Salt mixtures are used as molten electrolytes of chemical current sources, solvent melts of inorganic substances, heat storing compositions, fluxes for welding and soldering. Modern coolants include alkali metals and their halogenides. Lithium-containing thermofors have a special place. Density is one of the important properties of the melts used. The paper presents the analytical description of the density for the mixture melts of LiF + NaF of various compositions in the temperature range of 1130 ... 1320° K. As a result, an analytical equation was obtained, which made it possible to calculate the melt density of the eutectic mixture above liquidus by 5, 10, 50, 75, 100, 150, 200 and up to 1130° K. Similar data for eutectic compositions in the reference literature are not available. The isothermic and isoconcentration methods, the Karapetyans’s comparative method were used for description.

Key words: 
T-x-diagram
liquidus
lithium fluoride
sodium fluoride
melts
melting temperature
eutectic
density
calculation
graphical dependence
predicting
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Received: 
31.08.2020