The ionic conductivity in quasi-one-dimensional (ID) K2SbPO6, quasi-two-dimensional (2D) KSbP2O8 and K3Sb3P2O14, and network-three-dimensional (3D) K5Sb5P2O20 and KSb2PO8 was studied. The dominant factor affecting the ionic conductivity, which is highest, ~10−3 (Ω·cm)−1, in K5Sb5P2O20 and lowest, ~10−7 (Ω·cm)−1, in KSb2PO8 at 500 °C, is the size of the bottleneck rather than the “dimensionality”. The highest ionic conductivity observed in K5Sb5PO20) was further improved in the ion-exchanged compound Na6Sb5P2O20 to ~ 10−2 (Ω·cm)−1 at 500 °C. Direct ion-exchange reactions with cations smaller than K+ are not possible in 2D KSbP2O8 and ID K2SbPO6. Rb2SbPO6 is a new compound synthesized via ion exchange from K2SbPO6. The ionic conductivity and ion-exchange behavior are discussed in terms of the structural properties of the potassium phosphatoantimonates.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry