Replace Heteropoly Acid Synthesis, Characterization And Electrical Properties

Four kinds of substituted ternary heteropoly acids have been synthesized: (1) ternary decatungstodivanadogermanic heteropoly acid H₆GeW₁₀V₂O₄₀·22H₂O was synthesized by the stepwise acidification and the stepwise addition of solutions of the component elements; (2) three heteropoly acids in such a general formula as H_nM(H₂O)XW₁₁O₃₉ i.e. H₇[In(H₂O)CoW₁₁O₃₉]·14H₂O, H₆[In(H₂O)CrW₁₁O₃₉]·11H₂O and H₄[Ti(H₂O)TiW₁₁O₃₉]·7H₂O were synthesized by the stepwise acidification and the stepwise addition of solutions of the component elements as well as ion exchanging method. The optimal proportion of the component compounds and the pH of the synthesis reaction are given. The products were characterized by means of elementary analysis, potential titration, IR, UV, XRD and TG-DTA (DSC). Their proton conductivities were determined at room temperature.