Prepared single crystals containing different composition and did physical research. Shanks’s research results show that produce sodium tungsten bronze with the fused salt electrolysis process, the cubic single crystals can be obtained when tungsten trioxide’s mole percent (mol / O) in reactants is between 0-50. potassium tungsten bronze was grew in the experiment by the same method Shanks did, the Quartet (I) type single crystal can be obtained when tungsten trioxide’s mol / O is 45. When the Quartet (I) potassium- sodium tungsten bronze is inquired, tungsten trioxide’s mol / O should be maintained at between 30-50 in reactants. It was found in the experiment, the Quartet (II) type single crystal is generated when tungsten trioxide’s mol / O is too large; cubic single crystals is generated when too small. Which indicates that component’s impact on the Quartet (I) type monocrystalline generating is not obvious. For the Quartet (I) potassium- sodium tungsten bronze KxNayWO3, its x is about 0.40, y is about 0.7-0.5 times the value of x. This indicates that the potassium content of the Quartet (I) potassium- sodium tungsten bronze single crystal is relatively stable although the components of the reactants can vary over a wide range.

 

According to the comparison of this experiment and K_0.57WO₃, X-ray diffraction Na_0.28WO₃ ASTM card data, Na_0.28WO₃ lattice parameters a0 = 12.097A, c0 = 3.748A, smaller than  a0 = 12.317Ac, 0 = 3.841A of K_0.57WO₃. Taking into account the ionic radius of sodium ion is 0.98A, which is much smaller than the 1.33A ionic radius of potassium ions. Therefore, under appropriate conditions, it is relatively easy for sodium ions to insert into Quartet (I) of potassium tungsten bronze.

 

Integrated the above two points, it can be considered that potassium- sodium tungsten bronze is  the result of sodium ions inserting into the Quartet (I) potassium tungsten bronze.