Thermodynamic properties and single-electrode Peltier heats of a Li-Al alloy in a LiCl-KCl eutectic melt

Thermodynamic properties of a Li-Al alloy in the two-phase (alpha Al + beta LiAl), (beta LiAl + gamma Li3Al2), and (gamma Li(3)Al2 + liquid) regions, and in the single beta LiAl phase region were determined from electromotive force measurements in a LiCl-KCl eutectic melt at temperatures from 650 to 760 K. From the obtained thermodynamic properties, the single-electrode Pe ltier heat of a Li-Al alloy electrode was evaluated as a function of the al loy composition. It turned out that the single-electrode Peltier heat of a Li-Al alloy electrode exhibits discontinuities at the compositions of coexi sting-single phase boundaries. The change of the single-electrode Peltier h eat on a phase boundary was interpreted thermodynamically and was found to follow from thermodynamic data for the single phases and the phase diagram data. (C) 1999 The Electrochemical Society. S0013-4651(98)02-028-1. All rig hts reserved.