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Résumé. 2014 On the basis of the thermodynamic properties, the

practical operating temperatures the cell product will be Li2Se and that complete conversion of the cathode material (selenium) to this phase represents the maximum cell capacity. At temperatures below the monotectic (350.1~ solid Li2Se will form in the cathode after only slight discharge and its presence must be carefully considered in cells designed to operate in this temperature region. At temperatures above the monotectic, solid Li2Se will not form (under equilibrium conditions) until the cathode contains at least 30.5 a/o lithium, and cell potential will be constant throughout most of the discharge up to this point. In actual cell operation, consideration must of course be given to none~uilibrium phenomena, reaction kinetics, and possible interaction with the electrolyte (11). Further study of these areas is in progress.Additional investigation of the lithium-selenium system is needed, particularly at higher temperatures, to determine the critical temperature of the miscibility gap, and at high lithium contents to determine the liquidus in the region between Li2Se and lithium.ABSTRACT A brief historical account of the Hall effect in very dilute solutions is given in which the interest in Hall effect measurements for the knowledge of electrolytes is shown. Then a systematic examination is presented of the different parasitic voltages which are likely to appear in a Hall cell. The criteria to which the experimental setup must conform to allow detection of the Hall voltage are defined. (This voltage is from 0.1 to 1 ~V in our experiments.) Results of measurements in hydrochloric and nitric acid solutions are given confirming the theoretical predictions.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-06-04 to IP Vol. 118,No. 12

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