Electrical Conductivity Measurements of Molten Alkaline-Earth Fluorides

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Abstract

The electrical conductivities of molten BeF2, MgF2, CaF2, SrF2, and BaF2 were measured by electrochemical impedance spectroscopy. A new conductance cell was designed and constructed for the purpose of determining the electrical properties of highly conductive and very corrosive melts at temperatures as high as 1600°C. The cell is comprised of twin capillaries of pyrolytic boron nitride, 5 mm id x 10 cm long, two movable tungsten electrodes, and a molybdenum crucible. The ranking by specific electrical conductivity, k, was BeF2 < MgF2 < SrF2 < BaF2 < CaF2 and by molar electrical conductivity, ⧍m, was BeF2 < MgF2 < CaF2 < SrF2 < BaF2. Am was found to vary with the logarithm of the charge density of the metal cation over the entire series of alkaline–earth fluorides. With the exception of BeF2, In ⧍m was found to vary with In {V2/3M exp (Ec/RT)}, where Vm is the molar volume and Ec is the coulombic energy between nearest neighbor ions in the melt.

Original languageEnglish
Pages (from-to)1027-1032
Number of pages6
JournalJournal of the Electrochemical Society
Volume139
Issue number4
DOIs
Publication statusPublished - 1992 Apr

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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