| Popis: |
Structural changes and cation dynamics of a fast ion conducting glass 0.75AgI–0.25Ag 2 MoO 4 have been measured by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and 109 Ag solid-state nuclear magnetic resonance (NMR) both in the glassy and supercooled liquid states. In the glassy state, two Ag + populations exist with very different mobilities which are related to different co-ordination spheres. Above the glass transition temperature, the sample undergoes phase separation and gives β-AgI and 2AgI–Ag 2 MoO 4 (2:1) crystals. Cations dynamics decrease and chemical shift anisotropy structures arise. The ionic conduction is based on Ag + sites with mixed co-ordination, and no evidence of AgI clustering is found. |
