Thermal stability of Ba1-xCaxF2 solid solutions

Unexpected Coexisting Solid Solutions in the Quasi‐Binary Ag(II)F2/Cu(II)F2 Phase Diagram**

“…[4][5][6][7] However, the number of genuine fluoride solid solutions prepared to date is rather modest. During the last decade, several mixed-cation ionic Group 2 metal fluorides have been prepared, that is, (Mg 1À x M x )F 2 for M = Ca 2 + , Sr 2 + , Ba 2 + , [8,9] and (M a x M b 1À x )F 2 for M a,b = Ca 2 + , Sr 2 + , Ba 2 + , [10,11] largely with the intent to increase ionic mobility. [12] Only recently, multi-cation rutile-type fluorides, containing 4-7 cations (Co, Cu, Mg, Ni, Zn, Mn, and Fe) have been synthesized using a mechanochemical approach.…”

Nanotechnology and material science

“…For example, the crystalline solid solution Ba 1−x Ca x F 2 samples, prepared by mechanochemical treatment, can exist in a non-equilibrium state indefinitely. After heating, the system goes to the equilibrium state, namely, the decomposition of the solid solution takes place, and it is accompanied by heat release (exothermic effect) [10]. Apparently, the relative stability of the crystalline samples of the Ba 1−x Ca x F 2 solid solution is due to the extremely low values for the diffusion coefficients of the cations.…”