Abstract
Electrical properties of both the transparent gel and sodium β-alumina with the composition of Na 2O·6Al 2O 3 prepared by the sol-gel method were studied. The gel showed a relatively high electrical conductivity. The increase rate in the conductivity was changed at both temperatures, where shrinkage and transformation to sodium β-alumina started to occur. The β-alumina crystallized by the heat treatment at 1150°C was a good sodium ion conductor, though the structure detected by X-ray analysis was highly defective.
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