Praseodymium Chemistry-Heated Diffused Permeation is used to treat K 7 MgBW 11 O 39 for the first time.ICP,IR,XRD,TG-DTA,have been used to characterize K 7 MgBW 11 O 39 ·15H 2 O and treated sample,indicating that Pr can be permeated into the body of this sample.The results of AC impedance s pectra and DC four-probe show that the value of conductivity is 10 4 times higher than that of sample befo re permeation at room temperature.At the range of 301～576K,the conductivity of permeated sample almost keep constant a nd its thermal stability improved mo re than 150K,which imply that this mate rial is promising.
Potassium tungsten bronze KxLayWO3 (x>0.5 and y<0.01) was synthesized by rare earth co-permeation method using α-K7[SiMg3(OH2)3W9O37] as the precursor. Binding energies of La, W, O and C were determined by XPS. From the XPS data, a peak at 34.21 eV indicates that some W6+ turned into W5+ by rare earth co- permeation. The binding energies La3d were the same in the surface and inner of the composite, showing that rare earth element La could diffuse into the body of the composite and the compound of KxLayWO3 was formed at the same time. The binding energies of O1s in KxLayWO3 surface were 531.4 eV and 532.0 eV, respectively, while peak at 531.4 eV disappeared through etching process. The result implies that the binding energy of 531.4 eV was due to the adsorbent O. In addition, the binding energies of C1s in the surface were 283.5 eV, 285.0 eV and 286.7 eV respectively, while the inner had only one peak at 285.0 eV due to standard C1s. This proves that there was no C in the core.
