Solid solutions of K5+xSb5-xTixP2O20 (0 ≤ x ≤ 0.2) and K5-xSb5-xMxP2O20 (M = MoVI and WVI, 0 ≤ x ≤ 0.15) were prepared by solid-state reaction. Ionic conductivity was investigated from 200 to 500 °C by ac complex impedance measurement. The ionic conductivity of the Ti-substituted phase increases with increasing x to the limit of substitution (x = 0.2). This increase of conductivity is attributed to a larger bottleneck and an increase in the K+ concentration due to the Ti substitution. In the Mo/W-substituted phases, the conductivity increases with increasing x to the limit of substitution (x = 0.15) due to an increasing K+ vacancy concentration.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry