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

Measurement of the decomposition potential of aluminum oxide in trisodium aluminum fluoride-aluminum oxide and tripotassium aluminum fluoride-aluminum oxide melts

A. Silný, M. Malinovský, and K. Matiašovský

Institut für anorganische Chemie der Slowakischen Akademie der Wissenschaften, Bratislava 9

Abstract: The methods of measuring the decompn. potential of Al₂O₃ and of the other electrolyte components in the systems Na₃AlF₆-Al₂O₃ and K₃AlF₆ -Al₂O₃ in concns. 0-12.0% Al₂O₃  at 1000°C are described. The I-E curve method with 2 modifications was applied. In the first modification, an oscilloscope of slow processes with a relay input switch to register I-E curves and in the second one, an 8-coil galvanometer oscillograph and a transistor source of the linearly increasing voltage were applied. The results in both cases were practically the same. The dependence of the decompn. potential of Al₂O₃  on its concn. in the melt at 1000° is E^1000°_d(Al2O3) = 2669 - 496 (x + 1)^0.1 mV for Na₃AlF₆-Al₂O₃ and E^1000°_d(Al2O3) = 1914 + 259 (x + 1)^-0.5 mV for K3AlF6-Al₂O₃  with x = Al₂O₃ oncn. in wt. %.

Full paper in Portable Document Format: 238a561.pdf (in German)

Chemical Papers 23 (8) 561–573 (1969)