The activity of sodium in sodium-lead alloys was determined by the concentration cell method. The emf of cells Na (pure)/Na+/Na in Pb was directly measured up to 820~ using alumina containers impregnated with Na2CO~ in an argon atmosphere. Results were converted to activities and extrapolated to 1010~ To check the extrapolation, emf's of cells of the type Na(a,) in Pb/Na+/Na(a~) in Pb were measured up to I010~ The a~/a, ratios calculated from the measurements were compared with those obtained by extrapolation. Fair agreement was found.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.171.57.189 Downloaded on 2015-06-14 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.171.57.189 Downloaded on 2015-06-14 to IP
A qualitative and quantitative study of sodium-aluminum equilibria in cryolitealumina melts was undertaken to shed more light on the cathode reactions in the aluminum cell. Measurements were made in alumina crucibles from 940 ~ to 1010~ Lead was used as an auxiliary sodium "sink." Results show that, while aluminum is more noble than sodium, their deposition potentials are not far apart (of the order of 0.1-0.2 v), and that, under the nonequilibrium conditions existing in an industrial cell, some sodium may be codeposited with aluminum at the cathode.
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