Synthesis and conductivity of decatungstodivanadogermanic heteropoly acid

The decatungstodivanadogermanic heteropoly acid H6GeW10V2O40·22H2O was synthesized for the first time by the stepwise acidification and the stepwise addition of solutions of the component elements. The optimal proportion of the component compounds and the pH of the synthesis reaction are given. The product was characterized by means of inductively coupled plasma (ICP), IR, UV, X-ray diffraction and thermal analysis. The IR, UV and XRD indicate that H6GeW10V2O40·22H2O possesses the Keggin structure. The results of ac impedance measurement show that its proton conductivity is 1.20 × 10−2 S cm−1 at room temperature (16 °C).