The maximum measurement temperatures were limited to the extent at which the saturated vapor pressure of ZrCl 4 over the melts did not exceed 0.1–0.25 atm. The changes in the composition of molten mixtures caused by the evaporation of volatile ZrCl 4 during the experiments in the cells of this type were insignificant, because conductometric cells were sealed with porcelain rods that were tightly adjacent to the walls of the quartz tubes of the cell. The salt fusion cakes of the given compositions were loaded through a branch pipe (see Fig. In this work, we used platinum electrodes. The electrical conductivity measurements were carried out in the quartz capillary cells with a special design. All weightings and loadings into the ampoules and measuring cells were performed in a dry box under nitrogen atmosphere with <3 ppm water content. The ampoules were kept at the maximum temperature for 1–2 h and then slowly cooled to room temperature. The ampoules were slowly heated for several hours under the temperatures of 820 ☌–830 ☌, that is, to the temperature above the melting point of the most high-melting component,. To prepare the solutions of the desired compositions, the weighed portions of NaCl, KCl and CsCl were placed together with freshly prepared ZrCl 4 in quartz ampoules, which were then evacuated and soldered. Commercial ZrCl 4 (98+%) was sublimated 2–3 times in a vacuum and once in the atmosphere of pure helium. 2 ExperimentalĬommercial NaCl, KCl and CsCl (99.9+%) were vacuum dried and purified by 2–3-fold zone recrystallization. Thus, the aim of the current work is to study the electrical conductivities of the molten NaCl-ZrCl 4, KCl-ZrCl 4 and CsCl-ZrCl 4 systems around the first eutectic range ( <33 mol.%). However, to date, there are only very old and fragmentary literature data on the conductivities of the MCl-ZrCl 4 systems near the first eutectic range ( <33 mol.%). The electrical conductivities of the MCl-ZrCl 4 melts near the second, lower-temperature eutectic region (55–75 mol.% ZrCl 4) have been studied in our previous works, and in. The diagrams for the KCl-ZrCl 4 and CsCl-ZrCl 4 systems, ,, are similar to this diagram. The Na 2ZrCl 6 compound separates two eutectic ranges. The phase diagram of the NaCl-ZrCl 4 system.
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