Synthesis, rare earth co-permeation and conductivity of yttrium tungstophosphoric heteropoly complex

The synthesis of K₈H₃[Y(PW₁₁O ₃₉)₂]·25H₂O is reported for the first time. The composition is confirmed by chemical analysis, TG-DTA and ICP, IR, XRD, UV, ¹⁸³W-NMR and CV are used to characterize the title complex and the results show that the complex is β₂ type Keggin structure. Rare earth co-permeation is used to treat this complex and the results of ICP and XPS indicate that rare earth elements (La and Ce) have permeated and diffused into the body of this sample and exist in the forms of binding with other components. Its chemical formula is K₈H ₆YLa_0.11Ce_0.18P₂W^V ₄W^VI₁₈O₇₈·1.5H₂O and the crystal structure parameters were obtained by the analysis of XRD, those are crystal system: Monoclinic, lattice parameter: a = 6.3775nm, b = 3.6771nm, c = 3.7727nm, β = 90.192°, V = 88.47326nm³; The conductivity of permeated sample, at room temperature, is about 10³ times of that of K₈H₃[Y(PW₁₁O ₃₉)₂]·25H₂O and reach to 1.33 x 10 ^-2S·cm^-1 at 523K. The results of ¹H MAS NMR spectrum indicate three kinds of proton exit, which implies a proton conduct mechanism. So, this compound shows a promising application as conductive material.