Abstract
The conductivity has a minimum against ionic ratio in Na2−yAgyZr1.5Mg0.5(PO4)3 with a three dimensional network which is called as a mixed alkali effect (MAE). In this paper, we discussed23Na and31P MAS NMR spectra in MAE. The central line profiles exhibit characteristic changes due to values of asymmetry parameter η. The observed profiles are produced by the second-order quadrupole interaction with the electric field gradient. The peak intensity of side band against ionic ratio in MAS NMR spectra showed a small maximum due to the Na-Ag dipolar interaction which corresponds to the conductivity minimum. The chemical shifts of31P MAS NMR showed the strong dependence of polarizability of mobile ions that share oxygens in the PO4 tetrahedra and the ZrO6 octahedra. Their results indicate that there are some ordered structures of Na-Ag dependent on the ionic ratio in MAE.
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