The acid-base properties of the AlBr3-NaBr melts were examined on the basis of the EMF measurements of an aluminum-aluminum concentration cell and the following information was obtained: 1. The AlBr3-NaBr melts show a composition-dependent Lewis acidity that is similar to that found in the chloroaluminate melts. 2. The equilibrium constants of the two chemical equilibria (Eq.  and ) that characterize these melts have been determined: K′1= 3.5, K2 = 4.0 × 10−6. 3. For the same cationic constituent, the amount of “free” halide in the chloroaluminate melt is less than that in the bromoaluminate melt. This implies that the molecular dimer (Al2Br6) is very stable and behaves as a strong Lewis acid in the bromoaluminate melts. Manuscript submitted Feb. 1, 1988; revised manuscript received Feb. 6, 1989. Kyoto University assisted in meeting the publication costs of this article.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry