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

Published monthly
 

Dissociation of the anions AlF63- in the system Na3AlF6 —Na2SO4

I. Koštenská and M. Malinovský

Department of Inorganic Technology, Slovak Technical University, 880 37 Bratislava

 

Abstract:  The course of the liquidus of Na2SO4 in the system Na3AIF6 —Na2SO4 was determined. The eutectic point was found to be at 9.0 mole % Na3AlF6 and 91.0 mole % Na2SO4, tE = 794.5°C. The solubility of Na3AIF6 in solid Na2SO4 is negligible. The course of the liquidus curve of Na2SO4 in the composition interval of 91.0—96.0 mole % Na2SO4 is consistent with the assumption that the anions AlF63- undergo thermal dissociation according to the scheme AlF63- ⇌ AIF4- + 2F-. At a very low content of Na3AIF6 in Na2SO4 a total destruction of the anions AlF4 takes place under the formation of 7 new elementary particles from each molecule of Na3AIF6 in molten Na2SO4 . In the eutectic point of the system Na3AIF6—Na2SO4 the degree of thermal dissociation of AlF63- anions according to the given scheme equals 0.67. The calculated dissociation degree of pure cryolite is 0.21. The conclusions of some other papers concerning the given problems are discussed.

Full paper in Portable Document Format: 326a821.pdf

 

Chemical Papers 32 (6) 821–829 (1978)

Friday, December 06, 2019

IMPACT FACTOR 2018
1.246
SCImago Journal Rank 2018
0.274
SEARCH
Advanced
VOLUMES
International Conference on Coordination and Bioinorganic Chemistry
46th International Conference of SSCHE
© 2019 Chemical Papers