Arsenic triselenide
Arsenic Triselenide
Arsenic triselenide is a chemical compound with the formula As2Se3. It is a chalcogenide glass that is notable for its use in infrared optics and electronics. This compound is part of the larger family of arsenic selenides, which are known for their interesting optical and electronic properties.
Properties[edit | edit source]
Arsenic triselenide is a solid at room temperature and has a glassy appearance. It is typically dark red to black in color. The compound is known for its high refractive index and low phonon energy, making it suitable for infrared applications. It is also a semiconductor with a band gap of approximately 1.8 eV.
Structure[edit | edit source]
The structure of arsenic triselenide is composed of covalently bonded arsenic and selenium atoms. The compound forms a network of AsSe3 pyramids, where each arsenic atom is bonded to three selenium atoms. This network structure contributes to its glassy nature and its ability to form amorphous films.
Synthesis[edit | edit source]
Arsenic triselenide can be synthesized by direct combination of elemental arsenic and selenium at high temperatures. The reaction is typically carried out in a sealed tube to prevent the loss of selenium due to its volatility. The resulting product is then cooled to form a glassy solid.
Applications[edit | edit source]
Arsenic triselenide is used in a variety of applications due to its unique properties:
- Infrared Optics: It is used in the production of lenses and windows for infrared optics, particularly in thermal imaging systems.
- Optical Fibers: The compound is used in the manufacture of optical fibers for infrared transmission.
- Non-linear Optics: Due to its non-linear optical properties, arsenic triselenide is used in devices such as optical switches and modulators.
Safety and Handling[edit | edit source]
Arsenic triselenide, like other arsenic compounds, is toxic and should be handled with care. Proper safety equipment, such as gloves and goggles, should be used when handling this compound. It should be stored in a cool, dry place away from incompatible materials.
Also see[edit | edit source]
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