Proton and sodium conductivities of Na3Mo2P2O11(OH)·2H2O have been studied from 25 to 460°C. The proton conductivity ranged from ∼6×10-6 S/cm at 26°C to ∼2×10-5 S/cm at 60°C (Ea=32kJ/mole and and log σ0=0.02 S/cm). The profile of proton conductivity as a function of relative humidity is similar to a type III Brunauer adsorption isotherm and suggests that the conduction mechanism is of particle hydrate-type. The proton conductivities at 100°C are ∼5×10-7S/cm for RH=6% and ∼9×10-6S/cm for RH=100%. Sodium ion conductivity was studied in the dehydrated phase with conductivities σ267°C∼2×10-7 S cm (Ea= 104kJ mole) and σ457°C∼3×10-3 S cm (Ea= 208kJ mole). The proposed conduction mechanism for sodium ion conductivity is similar to that in Na-β-alumina.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics