Editing Tungsten trioxide (section)

==== Hexagonal WO₃ ====
A less common hexagonal polymorph of WO₃ has been reported and characterized using powder X-ray diffraction. It exhibits higher symmetry and potentially distinct electronic properties.

* '''Space group:''' ''P6/mmm'' (No. 191)  
* '''Lattice parameters (Å):''' a = 7.298(2), c = 3.899(2)  
* '''Angles (°):''' α = β = 90°, γ = 120°  
* '''Cell volume:''' 179.84 Å³  
* '''Z:''' 3  
* '''Temperature:''' Room temperature  
* '''Pressure:''' Atmospheric  
* '''R-value:''' 0.055  
* '''Reference:''' Gérand, B. et al. (1979). ''Journal of Solid State Chemistry'', 29, 429–434.<ref name="Sundberg 2144–2149"/>