Electrical conductivity of molten fluoride‑oxide melts with high addition of aluminium fluoride
Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology STU in Bratislava, Radlinského 9, 812 37 Bratislava, Slovak Republic
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Abstract: Electrical conductivity of NaF-AlF3 melts with an addition of 2 wt % Al2O3 and/or 5 wt % CaF2 was measured using a pyrolytic boron nitride tube‑type cell with a constant distance of electrodes. The molar cryolite ratios MR = n(NaF)/n(AlF3) were 1.8 and 1.6, and the temperature was varied from 865 °C to 1005 °C. Ac‑techniques with a sine wave signal with small amplitude in the high frequency range were applied. Electrolyte resistance was obtained from nonlinear regression analysis according to equivalent circuit. Experimental data were used to describe the dependence of the electrical conductivity in fluoride melts with lower temperature on the amount of various additions and temperature.
Keywords: electrical conductivity, cryolite based melts, boron nitride, tube‑type cell
Full paper in Portable Document Format: acs_0255.pdf
Acta Chimica Slovaca, Vol. 9, No. 2, 2016, pp. 141—145, DOI: 10.1515/acs-2016-0024