Thread:Peruwu/@comment-34423308-20180708205958/@comment-34423308-20180709120010

"Tungsten dioxide is the chemical compound with the formula WO2. The bronze-colored solid crystallizes in a monoclinic cell.[1]  The rutile-like structure features distorted octahedral WO6 centers with alternate short W–W bonds (248 pm).[1]  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."