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] |
| pratically 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
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
Tungsten diarsenide is a black solid. It forms crystals in the
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
- ^ ISBN 978-1-4615-4907-9.
- ^ ISBN 978-3-662-13401-6.
- ISSN 0008-4042.