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* L I linear in this range. Midorikawa states that the large contribution to the conductivity of the ternary mixtures is made by NaCl; the contribution from KC1 is only 50% of that made byNaC1. Analogy with the bin .ry melts (see above) suggests that maximum conductivity should occur at the composition NaA1Cl4 - KA1C14 (i. e. , 50 mol % AlCl,, 25 mol % NaC1, and 25 mol KC1). Melts containing A1CJ3,NaC1, and KC1 are stable. They have been used as reaction media for organic reactions [e.g. , addition of KC1 to C2H4 (Ref. 19)]. It appears that these melts can be used in Pyrex (or Vycor) glass at temperatures up to 700 "C (Refs. 2,19,and 20). At temperatures up to 800 "Cy Grothe (Ref. 11) used a quartz reaction vessel. On the other hand, Fisher and Simon (Ref. 2) reported that when an A1C13-NaC1 melt with the NaA1C14 composition was electro- lyzed in quartz crucibles, corrosion of the crucibles occurred. They concluded that this was due to Al, o r low .valency A1 compounds dissolved in the melt. The species of Si dissolved in the melt was not identified. Preparation and Purificationof A1C13-KC1-NaC1 Melts All experimental work was carriedout in the argon atmosphere of a "Lab Con Co. " purge type glove box. Analyzed argon wirh a water content of less than 1.5 ppm was used. "Baker Analyzed" NaCl and KC1 were employed, but A1C13 from a number of different suppliers was tried. Our first experiments were conducted with the composition of the ternary eutectic containing 66 mol % A1C13,14 mol KC1, and 20 mol % NaC1. "BakerAnalyzed"anhydrous A1C13 wasused(thiswascertified as being 99% pure). The salts were weighed out in correct portions, well mixed, and fused on a hot plate. A greyish-brown melt was readily formed. Other investigators (Ref. 21) have also observed this coloration and attribute it to carbonaceous material and the presenceof FeC13 impurity in the A1C13. Filtration of the molten eutectic through a fine (25-y) glass frit did not appear to change the color at all, but did remove some particulate matter. 9PDF Image | ALUMINUM CHLORINE BATTERY
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