Abstract
New sodium-ion conducting glass–ceramics composed of Na 1+ x Al x Ge 2− x P 3O 12(0.3 ≤ x ≤ 1.0) crystalline conducting phase with NASICON-type structure were successfully prepared by heat-treating the parent glass. The products were characterized with DSC, XRD, SEM, FTIR and electrochemical impedance spectroscopy techniques. The results showed that all these compounds were isomorphous with NaGe 2P 3O 12, showing characteristic PO 4 vibrational bands. The conductivities of the glass–ceramics were higher than those of the corresponding sintered ceramics and two orders of magnitude higher than the parent glass. Among the series studied, the composition of x = 0.8 exhibits the highest conductivity of σ = 3.8 × 10 −4 S/cm at 300 °C ( E a = 0.54 eV). In addition, the reasons for the enhancement of the conductivity in glass–ceramics were discussed in view of the microstructure morphology dependent upon the heating conditions.
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