澳门老永利总部

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

澳门老永利总部Hill system formula: O2W1

CAS registry number: 12036-22-5

Formula weight: 215.839

澳门老永利总部Class: oxide

澳门老永利总部Physical properties

Colour

brown

Appearance

澳门老永利总部crystalline solid

Melting point

1500°C

澳门老永利总部Boiling point

1730°C

Density

10800 kg m-3

澳门老永利总部Element analysis

Element percentages for the elements in tungsten dioxide

Element

%

W

85.17

O

14.83

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澳门老永利总部More info>>

1.Tungsten Oxide

2.Tungsten Trioxide