Tungsten Dioxide
Tungsten dioxide is the chemical compound with the formula WO2. The bronze-colored solid crystallizes in a monoclinic cell. The rutile-like structure features distorted octahedral WO6 centers with alternate short W–W bonds (248 pm). Each tungsten center has the d2 configuration, which gives the material a high electrical conductivity.
WO2 is prepared by reduction of WO3 with tungsten powder over the course of 40 hours at 900 °C. An intermediate in this reaction is the partially reduced, mixed valence species W18O49.
2 WO3 + W → 3 WO2
The molybdenum analogue MoO2 is prepared similarly. Single crystals are obtained by chemical transport technique using iodine. Iodine transports the WO2 in the form of the volatile species WO2I2.
Formula as often written: WO2
Hill system formula: O2W1
CAS registry number: 12036-22-5
Formula weight: 215.839
Class: oxide
Physical properties
Colour |
brown |
Appearance |
crystalline solid |
Melting point |
1500°C |
Boiling point |
1730°C |
Density |
10800 kg m-3 |
Element analysis
Element percentages for the elements in tungsten dioxide |
|
Element |
% |
W |
85.17 |
O |
14.83 |
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