Simultaneous Measurement of Differential Thermal Analysis and Electrolytic Conductivity in lodide/lodine Mixtures

E. Kirowa-Eisner, A. Brestovisky, I. Reshef, M. Brand, E. Gileadi

Research output: Contribution to journalArticlepeer-review

Abstract

A computer-controlled experimental setup is described, which allows simultaneous determination of electrolytic conductivity and differential thermal analysis in several cells. The setup can be used to study the processes occurring during phase transitions in multicomponent systems. Electrolytic conductivity is measured by the four-electrode method, allowing the use of a large variety of electrode materials that may be needed for corrosive media, while ensuring high accuracy. Conductivity values can be measured in the range of 10-8S to IS. The system developed operates between -50° and +130°C and measurements can be conducted in eight cells in parallel. Both the temperature range and the number of cells can be readily extended. A Pyrex glass cell, in which a solid-city-group thermometer is physically separated from, yet in good thermal contact with, the solution, was designed, to allow work in highly corrosive liquids. The scope and validity of the experimental setup is verified by measurements in solutions of iodide salts in iodine and of NaCl in water. It is observed that, in the two-phase region between the melting point of the pure solvent and that of the eutectic mixture, the specific conductivity is relatively high and does not change much with temperature. It seems that, just above the melting point of the eutectic, a small amount of the concentrated solution wets the surface of the solid particles, forming a continuous path of conductivity through the liquid between the electrodes.

Original languageEnglish
Pages (from-to)555-559
Number of pages5
JournalJournal of the Electrochemical Society
Volume133
Issue number3
DOIs
StatePublished - Mar 1986

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