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* ALUMINUM CHLORIDE-ALKALI HALIDE MELTS Properties of the Melts AlC13 itself melts at a low temperature (190 "C), but has a very low conductivity [at 700 "Cy K = 6.56 x. 10-6 R-1 crn-', and in the region of the melting point it is even lower (Ref. 1)1. However, it is possible to obtain a lower melting system with considerably . increased conductivity by addition of NaCl and/or KC1. The available data onA1C13-alkali halide eutectics are listed in T alde I. It can be readily seen that much work has been done on the A1C13-NaC1,A1C13-KC1 and the A1C13-NaC1-KC1 mixtures. The other alkali halides, however, have received scant attention. Thermal analysesof the AlC13-KC1-NaC1 system have been carried out (Refs. 2 and 3). The complete phase diagram, taken from Ref 2, is shownin Fig. 1and several cross sections from it are shown in Fig. 2. A s can be seen from Table I, the lowest melting eutectic in the A1C13-NaC1-KC1 system is formed between the inter- mediatecompounds KA1C14,NaA1C14, and A1Cl3. Its melting point was reported to be 70 "C at an approximate compositionof 66 mol % A1C13, 14 mol % KC1, and 20 mol NaC1. ReferencetoTable I reveals that little is known about the AlC13 rich region, i. e. , the low temperature region of the phase diagram. In this region, we can anticipate a rather high vapor pressure of AlC13, since not all of the AlC13 will be present as the complex A1C14-. It has, however, been proposed (Ref. 3) that in anAlC13 rich melt the following solvation processtakes place: A1C13 +AlClp *A12C1,- Conductivity and density measurements have been carried oubty Midorikawa (Ref. 18) on the ternary melt. In the temperature range 130 to 205 "C and composition range 21.3 to 40.4mol NaCl and 5. 8 to 23.9 mol % KC1, the conductivity lies in the range 0. 365 to 0. 118 n-'cm-l. The relation between K and temperature is approximately 5PDF Image | ALUMINUM CHLORINE BATTERY
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