Protonic conductivity of neutral and acidic silicotungstates

Synthesis and characterization of aluminum or copper tungstophosphate and tungstosilicate immobilized in a polymeric blend

“…3c), though slightly shifted. The behaviour resembles what has been reported in the literature for the Na + and K + type A salts [16].…”

2-Methoxynaphthalene acylation using aluminum or copper salts of tungstophosphoric and tungstosilicic acids as catalysts

“…These salts presented low crystallinity and their diffraction patterns only showed some of the characteristic peaks of the cubic structure of H 4 SiW 12 O 40 •6H 2 O or H 4 SiW 12 O 40 . Vakulenko et al [26] have reported the same type of behavior for the Na + or K + soluble salts, contrary the high crystallinity displayed by the Rb + or Cs + insoluble salts of TSA [26,27].…”

Fabrication and properties of hybrid membranes based on salts of heteropolyacid, zirconium phosphate and polyvinyl alcohol

“…The proton conductivity increased with increasing substitution of proton with cesium. The charge carriers in the acidic salt of silicotungstic acid are increasing leading to increased proton conductivity in PVA-ZrP-Cs 2 SWA compared to PVA-ZrP-Cs 1 SWA hybrid membrane [24]. Proton conductivity is steadily increasing with temperature for both the hybrid membranes and for comparison the corresponding Fig.…”

“…It also contributes to protonic conduction through the proton of phosphate moiety and crystalline water thereby reducing the humidity dependence on conductivity. The conductivity of salts of silicotungstic acid was studied [24]. The high protonic conductivity is due to mobile proton that is present as an admixture in the crystalline structure of synthesized salt [25] or due to the presence of crystalline water.…”