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What (who) is dioxide$21473$ - definition
![US Geological Survey]] volunteer tests for sulfur dioxide after the [[2018 lower Puna eruption]].](https://commons.wikimedia.org/wiki/Special:FilePath/20180519 USGS Leilani Estates Hawaii Volcanic EruptionDSC 0411 medium.jpg?width=200 "US Geological Survey]] volunteer tests for sulfur dioxide after the [[2018 lower Puna eruption]].")
![A sulfur dioxide plume from [[Halemaʻumaʻu]], which glows at night](https://commons.wikimedia.org/wiki/Special:FilePath/Sulfur dioxide emissions from the Halema`uma`u vent, glows at night.jpg?width=200 "A sulfur dioxide plume from [[Halemaʻumaʻu]], which glows at night")
![{{CO2}} concentration meter using a [[nondispersive infrared sensor]]](https://commons.wikimedia.org/wiki/Special:FilePath/CO2Mini monitor TFA Dostmann.jpg?width=200 "{{CO2}} concentration meter using a [[nondispersive infrared sensor]]")
Wikipedia
Tungsten(IV) oxide 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.
