Rare earth co-permeation of K6HCoGeW11O40 was reported. The co-permeation temperature was decided by TG-DTA and the ICP results of permeated sample indicate that La and Ce have permeated into the body of this compound. The results of XPS imply that chemical bonds exist between La, Ce and other components of this sample. The XRD patterns show great difference between K6HCoGeW11O40 and permeated sample. Such result gives evidence that the structure of K6HCoGeW11O40 is destroyed and new compounds perhaps formed. Four-probe method and AC impedance spectra were used to measure the conductivities of K6HCoGeW11O40 and permeated complex. The conductivity of complex, at room temperature, improves 2.95×103 times after being permeated. Analyses of AC impedance spectra of permeated compound at different temperatures show that current carrier has changed.
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