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SP R CONDUCTIVITY MEASUREMENTS IN AlCl3 -KCl -NaCl Experimental For these measurements, we designed a capillary conductivity cell (shown schematically in Fig. 1) of Vrex glass with platinized platinum electrodes. This was mounted in a test-tube-like vessel containing a side arm for the connection to the pressure-controlled A r atmosphere. To ensure a uniform melt composition in the measuring capillary and in the remaining part of the vessel, the melt was mixed by forcing it out of the measuring section by a short application of positive A r pressure to the center tube of the cell before each measurement. Temperature was measured by a thermocouple directly at the capillary (see Fig. 1). The whole arrangement was heated by a stirred silicone oil bath controlled to k0.2 " C by a Matheson Lab Stat in conjunction with a two-stage heater. The assembling of the cell and handling of the melt were performed in the Ar atmo-sphere of the dry box. measured by a precision ac bridge. Results The specific conductivity, K SP' is given by a K =- (ohm-' cm-l) The cell resistance was where a is the cell constant and R is the measured resistance. determined in the standard way by using 1NKCl solution and the tabulated values for its conductivity (it was found to be 319.24 cm- Generally, we used a measuring frequency of 1 kHz after establishing that the measured resistance values were in- dependent of the ac frequency used (100Hzto 10k&) ~ Table I shows the measured resistances and the specific conductivities of the AlCls-KCl-NaC1 melt (57.5-12.5-30.0 mol %) which was used in many of our electro- chemical investigations. Fig. 2 shows the temperature dependence of the conductivity data in an Arrhenius plot. These data can be represented very well by a straight line. A least-squares fit leads to: K SP = 11.4,t 0.9 exp R T (125 to 185 "c) where the given range represents the 95% confidence limits. -4- The cell constant wasPDF Image | NASA ALUMINUM CHLORINE BATTERY
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