ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dissociation of the cryolite anion in the transition point on the liquidus line of barium chloride

I. Koštenská and Ľ. Machů

Department of Inorganic Chemistry, Slovak Technical SSO 37 Bratislava University,

Abstract: The dissocn. of the complex hexafluoroaluminate anion in the systems BaCl₂-Na₃AlF₆ and BaCl₂-Li₃AlF₆ was investigated. For the detn. of the unknown k_{Na3AlF6/BaCl2} and k_{Li3AlF6/BaCl2} from the shape of the expt. liquidus line of BaCl2, the rule of constancy of the product of Stortenbeker correction factor and of the compn. of the added component was applied. The system BaCl₂-Li₃AlF₆ was measured in the whole compn. range; it was found to be a simple eutectic system with the following coordinates of the eutectic point: 62 mole % BaCl₂, 38 mole % Li₃AlF₆, and Te = 650 ± 1°. The position of the transition point on the liquidus line of BaCl₂ in systems with cryolites indicates that both k_{Na3AlF6/BaCl2} and k_{Li3AlF6/BaCl2} equal 9, the no. of particles decreasing with increasing cryolite concn. At ∼5 mol % Na₃AlF₆ (Li₃AlF₆), the no. of particles indicates the presence of the complex cryolite anion AlF₆^3-.

Full paper in Portable Document Format: 304a458.pdf

Chemical Papers 30 (4) 458–468 (1976)