Structural Analysis and Electrical Property of Tungsten Bronze Prepared by Rare Earth Gaseous Permeation

摘要

The cubic sodium tungsten bronzes, Na_xWO_3(a; =0. 854 and 0. 814)were prepared by rare earths gaseous permeation method. Structural analysis was earned out by Rietveld method from powder X-ray diffraction data. The X-ray diffraction profile calculated with cubic F32 models are in good agreement with the observed X-ray diffraction patterns. There is only a little difference in W - 0 bond and Na - 0 bond between Na_(0.854)W O_3 and Na_(0.814) W O_3. Conductivity measurements indicate that Na_xW O_3 show anomalous semiconducting behavior and percolation model was used to interpret it.