Tungsten(VI) oxide, also known as tungsten trioxide is a chemical compound of oxygen and the transition metal tungsten, with formula . The compound is also called tungstic anhydride, reflecting its relation to tungstic acid . It is a light yellow crystalline solid.

Monoclinic WO<sub>3</sub>

  • Space group: P1/c1 (No. 7)
  • Lattice parameters (Å): a = 5.27710(1), b = 5.15541(1), c = 7.66297(1)
  • Angles (°): α = γ = 90°, β = 91.7590(2)
  • Cell volume: 208.38 Å<sup>3</sup>
  • Z: 4
  • Temperature: 5 K
  • Pressure: Atmospheric
  • R-value: 0.09
  • Reference: Salje, E.K.H. et al. (1997). Journal of Physics: Condensed Matter, 9, 6563–6577.

Uses

Tungsten trioxide is a starting material for the synthesis of tungstates. Barium tungstate is used as an X-ray screen phosphors. Alkali metal tungstates, such as lithium tungstate and cesium tungstate , give dense solutions that can be used to separate minerals.

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  • International Tungsten Industry Association
  • Preparation of tungsten trioxide electrochromic films
  • Sigma Aldrich (supplier)