Abstract
In the system Na 2OY 2O 3P 2O 5SiO 2, glass-ceramic NASICON with a conductivity of ca. 0.1 S/cm at 300°C and an activation energy of ca. 22 kJ/mol was obtained. Those materials were structurally analogous to Na 5YSi 4O 12. Their complex admittance diagrams consisted of two semi-circles at lower temperatures. From an analysis using an equivalent circuit, the two components were attributed to crystallized grains and residual glassy parts. It was also established that the total conductivity is strongly affected at lower temperatures by the residual glass, while at higher temperatures its influence was scarcely to be found.
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