Tungsten diarsenide
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| Identifiers | |
|---|---|
3D model (JSmol)
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| Properties | |
| As2W | |
| Molar mass | 333.68 g·mol−1 |
| Appearance | black solid[1] |
| Density | 6.9 g·cm−3[1] |
| practically insoluble[2] | |
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 diarsenide is an arsenide of tungsten with the chemical formula WAs2. Other tungsten arsenides include tungsten triarsenide (WAs3) and ditungsten triarsenide (W2As3).[1][3]
Preparation
[edit]Tungsten diarsenide can be produced by the direct reaction of tungsten and arsenic at 600 to 1000 °C. It can also be formed by the reaction of arsenic or arsine and tungsten hexachloride.[1][2]
Properties
[edit]Tungsten diarsenide is a black solid. It forms crystals in the monoclinic crystal system with the same structure of molybdenum diarsenide. Tungsten diarsenide is insoluble in hydrofluoric acid, hydrochloric acid and alkaline aqueous solutions. It reacts with concentrated nitric acid and sulfuric acid.[1] At high temperatures, tungsten diarsenide reacts with air to form tungsten trioxide and arsenic trioxide.[2]
References
[edit]- ^ a b c d e Erik Lassner, Wolf-Dieter Schubert (2012). Tungsten Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds. Springer Science & Business Media. p. 145. ISBN 978-1-4615-4907-9.
- ^ a b c R. J. Meyer (2013). Wolfram. Springer-Verlag. p. 207. ISBN 978-3-662-13401-6.
- ^ Taylor, J. B.; Calvert, L. D.; Hunt, M. R. (1965-11-01). "THE ARSENIDES OF TUNGSTEN AND MOLYBDENUM: WAs 2 , W 2 As 3 , MoAs 2 , Mo 2 As 3 , AND Mo 5 As 4". Canadian Journal of Chemistry. 43 (11): 3045–3051. doi:10.1139/v65-419. ISSN 0008-4042.