From the exterior, potassium sodium tungsten bronze and potassium tungsten bronze are fuchsia layered single crystals. Structure of the Quartet (I) potassium tungsten bronze is similar to the Quartet (I) potassium tungsten bronze, the lattice parameters are a0= 12.223A, c0= 3.882A. So it’s expected that some performance of potassium and sodium tungsten bronze should be similar to potassium tungsten bronze with the same crystalline form, while quite different from sodium tungsten bronze.

 

Raman scattering experiments have proven this, Raman spectra of potassium tungsten bronze is quite different from sodium tungsten bronze, that Raman peaks of sodium tungsten bronze did not appear in potassium tungsten bronze Raman spectrum. Raman spectrum of Potassium tungsten bronze is very smooth and simple. Raman spectra of potassium sodium tungsten bronze is similar to potassium tungsten bronze.

 

For the infrared absorption spectrum, absorption peaks at 958cm-1 of sodium tungsten bronze and potassium tungsten bronze spectra don’t show in potassium sodium tungsten bronze spectrum. Figure 1 shows relationship of K_0.39Na_0.27WO₃ and K_0.44WO₃ and total conductivity and temperature. It can be seen from Figure 1, the total conductivity of potassium sodium tungsten bronze is smaller than potassium tungsten bronze, but little difference between activation energy,  0.09eV of potassium sodium tungsten bronze and 0.08eV of potassium tungsten bronze.

 

Cubic and tetragonal (I) type structures of tungsten bronze intercalation compound are based on one-dimensional channel features. For the potassium sodium tungsten bronze, there are two different kinds of ions contained in one-dimensional channel. So the symmetry of one-dimensional channel occupied by single ion is destroyed, with the result that the Raman spectrum looks simple and unstructured, infrared absorption spectrum also looks simple and featureless.

 

According to the above experimental results, the mechanism of ion diffusion in potassium sodium tungsten bronze was proposed. Tetragonal (I) potassium sodium tungsten bronze is consisted of skeletal structure that tungsten trioxide octahedra linked. These octahedral arranged makes channel for the cation filling. The potassium and sodium ions are in channels at the same time, resulting in topological transformation of skeleton structure so that the better match between the aperture and the movement of the ion channel had been damaged, and thus ion diffusion gets slow. This is also related to that the content of alkali metal ions in potassium and sodium tungsten bronze is higher than the sodium tungsten bronze or potassium tungsten bronze and the foreign ions get into the skeleton structure.