2003 年 44 巻 6 号 p. 1120-1123
Copper-β″-alumina was prepared by ion exchange reactions starting with a sodium-β″-alumina. Exchange from sodium ion to copper ion was done by immersing the sample in liquid cuprous chloride. Exchange of Na+ ion in β″-alumina to Cu+ ion was not complete as Na+ ion remained in the β″-alumina. Copper activity in solid copper–nickel alloys was measured by electromotive force (EMF) technique incorporating the partially exchanged (Cu+–Na+)-β″-alumina as a solid electrolyte for temperatures between 870 and 1300 K. The activities of copper and nickel in the solid solution at these temperatures exhibited positive deviations from Raoult’s law. The activity data were compared with other investigators obtained using ZrO2+CaO or ThO2+Y2O3 solid electrolyte.
