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Beryllium fluoride is exceptionally chemically stable, and LiF/BeF 2 mixtures have low melting points (360–459 °C) and the best neutronic properties of fluoride salt combinations appropriate for reactor use. MSRE used two different mixtures in the two cooling circuits.
FLiBe is a molten salt made from a mixture of lithium fluoride (LiF) and beryllium fluoride (BeF 2). It is both a nuclear reactor coolant and solvent for fertile or fissile material. It served both purposes in the Molten-Salt Reactor Experiment (MSRE) at the Oak Ridge National Laboratory.
It can be formed by melting sodium fluoride and beryllium fluoride. [32] The gas above molten sodium tetrafluoroberyllate contains BeF 2 and NaF gas. [11] Lithium tetrafluoroberyllate takes on the same crystal form as the mineral phenacite. As a liquid it is proposed for the molten salt reactor, in which it is called FLiBe. The liquid salt has ...
Electrolysis of a mixture of beryllium fluoride and sodium fluoride was used to isolate beryllium during the 19th century. The metal's high melting point makes this process more energy-consuming than corresponding processes used for the alkali metals.
Hydrogen fluoride and water also form several compounds in the solid state, most notably a 1:1 compound that does not melt until −40 °C (−40 °F), which is 44 degrees Celsius (79 degrees Fahrenheit) above the melting point of pure HF. [35]
Barium fluoride is an inorganic compound with the formula Ba F 2. It is a colorless solid that occurs in nature as the rare mineral frankdicksonite . [ 9 ] Under standard conditions it adopts the fluorite structure and at high pressure the PbCl 2 structure. [ 10 ]
Typically lithium fluoride is mixed with beryllium fluoride to form a base solvent , into which fluorides of uranium and thorium are introduced. Lithium fluoride is exceptionally chemically stable and LiF/ BeF 2 mixtures ( FLiBe ) have low melting points (360 to 459 °C or 680 to 858 °F) and the best neutronic properties of fluoride salt ...
A low melting point simplifies melting the salt at startup and reduces the risk of the salt freezing as it is cooled in the heat exchanger. Due to the high "redox window" of fused fluoride salts, the redox potential of the fused salt system can be changed. Fluorine-lithium-beryllium ("FLiBe") can be used with beryllium additions to lower the ...