Solid Solutions in Aluminum Electrolytes with the Participation of LiF

The paper presents the investigation of solid solutions formation in fluoride system Na5Al3F14-Na3AlF6-K3AlF6 with addition LiF. Two local regions were under consideration. first case concerns possibility potassium and sodium cations replacing lithium elpasolite (K2NaAlF6) when LiF is added to electrolyte. In second, effect on chiolite (Na5Al3F14) was studied. motivated by need control composition electrolyte during electrolytic production aluminum. samples obtained from initial fluorides laboratory conditions. Determination crystal-chemical details structure carried out method full-profile analysis (Rietveld method) multiphase polycrystalline samples. It found that accompanied a gradual substitution for formation, ultimately, K2LiAlF6 phase lattice parameter = 8.0779 Å. Potassium not subject substitution. No dissolution cryolite (Na3AlF6) found. shown does form upon crystallization