Tungsten(IV) oxide
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| Names | |
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| Other names
Tungsten dioxide
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| Identifiers | |
3D model (
JSmol ) |
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ECHA InfoCard
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100.031.662 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| WO2 | |
| Molar mass | 215.839 g/mol |
| Appearance | Bronze solid |
| Density | 10.8 g/cm3 |
| Melting point | 1,700 °C (3,090 °F; 1,970 K) decomposes |
| Negligible | |
| 5.7×10−5 cm3/mol | |
| Structure | |
| Distorted monoclinic), mP12 , space group P21/c, no 14
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| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
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Tungsten disulfide |
Other cations
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Molybdenum(IV) oxide
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Tungsten(VI) oxide
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tungsten(IV) oxide is the
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.[2][3]
References
- ^ ISBN 0-19-855370-6
- ISBN 978-0-470-13261-6.
- ISBN 978-0-470-13244-9.
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