Electrical Conductivity Measurements of Binary Solutions of Molten Alkaline-Earth Fluorides

Kwang Bum Kim, Donald R. Sadoway

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The electrical conductivities of binary solutions of molten MgF2-CaF2, MgF2-SrF2, MgF2-BaF2, CaF2-SrF2, CaF2-BaF2, and SrF2-BaF2 were measured by electrochemical impedance spectroscopy in a conductance cell comprising twin capillaries of pyrolytic boron nitride, movable tungsten electrodes, and a molybdenum crucible. In three of the systems, MgF2-CaF2, CaF2-SrF2, and SrF2-BaF2, the specific electrical conductivity was found to vary linearly with composition at constant temperature, while in the other three systems, MgF2-SrF2, MgF2-BaF2, and CaF2-BaF2, there were pronounced negative deviations from additivity. In a given binary system, the relative excess specific conductivity was found to vary parabolically with composition at constant temperature. In a homologous sequence the parabolic constant was proportional to the relative polarizability of the cations comprising the binary system.

Original languageEnglish
Pages (from-to)2128-2133
Number of pages6
JournalJournal of the Electrochemical Society
Volume139
Issue number8
DOIs
Publication statusPublished - 1992 Jan 1

Fingerprint

Fluorides
Molten materials
Earth (planet)
Tungsten
Molybdenum
Boron nitride
Crucibles
Chemical analysis
Electrochemical impedance spectroscopy
Cations
Positive ions
Temperature
Electrodes
Electric Conductivity
boron nitride

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The electrical conductivities of binary solutions of molten MgF2-CaF2, MgF2-SrF2, MgF2-BaF2, CaF2-SrF2, CaF2-BaF2, and SrF2-BaF2 were measured by electrochemical impedance spectroscopy in a conductance cell comprising twin capillaries of pyrolytic boron nitride, movable tungsten electrodes, and a molybdenum crucible. In three of the systems, MgF2-CaF2, CaF2-SrF2, and SrF2-BaF2, the specific electrical conductivity was found to vary linearly with composition at constant temperature, while in the other three systems, MgF2-SrF2, MgF2-BaF2, and CaF2-BaF2, there were pronounced negative deviations from additivity. In a given binary system, the relative excess specific conductivity was found to vary parabolically with composition at constant temperature. In a homologous sequence the parabolic constant was proportional to the relative polarizability of the cations comprising the binary system.",
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Electrical Conductivity Measurements of Binary Solutions of Molten Alkaline-Earth Fluorides. / Kim, Kwang Bum; Sadoway, Donald R.

In: Journal of the Electrochemical Society, Vol. 139, No. 8, 01.01.1992, p. 2128-2133.

Research output: Contribution to journalArticle

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