Heat-Storage Mixture of Sodium Halogenides and Chromates

A three-component system of sodium chlorides, bromides, and chromates was studied with differential thermal, differential scanning calorimetric methods of physicochemical analysis. The ratio of the components in the invariant composition, which crystallizes at 555°C with a specific enthalpy of melti...

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Bibliographic Details
Published in:High temperature 2021, Vol.59 (1), p.73-76
Main Authors: Verdiev, N. N., Garkushin, I. K., Verdieva, Z. N., Burchakov, A. V., Kondratyuk, I. M., Egorova, E. M.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Bromides
Classical and Continuum Physics
Complex systems
Composition
Differential thermal analysis
Enthalpy
Industrial Chemistry/Chemical Engineering
Invariants
Laser Matter Interaction
Materials Science
Physical Chemistry
Physics
Physics and Astronomy
Sodium
Sodium chloride
Sodium chromate
Solid phases
Thermal energy
Thermophysical Properties of Materials
Three dimensional models
Working fluids
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Summary:A three-component system of sodium chlorides, bromides, and chromates was studied with differential thermal, differential scanning calorimetric methods of physicochemical analysis. The ratio of the components in the invariant composition, which crystallizes at 555°C with a specific enthalpy of melting of 92.9 J/g, is established. It is noted that the solid phase contains a polymorphic transformation Na 2 CrO 4 at 423°C with a specific enthalpy of 42.6 J/g. The developed composition can be used as a working fluid in devices that accumulate thermal energy in a temperature range of 300 to 600°C. A three-dimensional model is constructed for the phase complex systems Na + ||Cl – , Br – , and the identified mono- and invariant phase reactions. The spatial model of the system makes it possible to analyze the phase complex of the system and to construct arbitrarily selected isothermal and polythermal sections.
ISSN:0018-151X
1608-3156
DOI:10.1134/S0018151X21010156