Thermodynamic evaluation and optimization of the (LiF+NaF+KF+MgF2+CaF2+SrF2) system

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

“…1,34,20 Indeed, it is well known that within the family of molten fluorides important modifications in the thermodynamic and transport properties occur when the nature of the cation is changed. 35,36 One can distinguish acidic cations, which tend to form long-lived ionic bonds 37 with the fluoride anions from basic ones, which provide "free" fluoride anions to the melt, even though a proper scale of acidity remains to be built in these media 38 . Molten rare earth/actinide (and analogous cations) fluorides typify acidic molten fluoride.…”

The solubility of sodium and potassium fluorides in strontium fluoride

“…The formation of solid solution must be considered in thermodynamic modeling of phase equilibria in the system NaF-SrF 2 [17].…”

“…In many synthetic processes, the ions of sodium and/or potassium are in the protocols [16]. Multicomponent ionic melts, including fluorides of strontium and alkali metals, are promising for use in metallurgy and nuclear power engineering [17].…”

Thermodynamic evaluation and optimization of the Li, Na, K, Mg, Ca, Sr // F, Cl reciprocal system

“…If, simultaneously, there is also strong second-nearest-neighbor (cation-cation) short-range ordering, the solution becomes even more difficult to model. The (LiCl + NaCl + KCl + MgCl 2 + CaCl 2 + SrCl 2 ) [1,2] and (LiF + NaF + KF + MgF 2 + CaF 2 + SrF 2 ) [3,4] systems have been optimized previously using the Modified Quasichemical Model in the Pair Approximation [5,6], in which secondnearest-neighbor (cation-cation) short-range ordering is described in terms of the following equilibrium:…”

“…doi:10.1016/j.jct.2011.03.015 reactions, similar to reaction (1). Note that, in common-ion systems such as (LiCl + NaCl + KCl + MgCl 2 + CaCl 2 + SrCl 2 ), the quadruplets ABX 2 are identical to the second-nearest-neighbor (A-X-B) pairs, so that the optimized parameters obtained previously for this system [1,2] and for the corresponding commonion fluoride system [3,4] using the Modified Quasichemical Model in the Pair Approximation can be used directly in this work. It has to be noted that, to a lesser extent, second-nearest-neighbor anion-anion ordering can play a role.…”