High Purity Arsine (AsH3) Specialty Gases
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Arsine (AsH3) is a colorless, toxic, and flammable gas at room temperature. It is a metalloid hydride with the molecular formula AsH3 and is used in the semiconductor industry for doping and in the production of certain arsenic compounds.
Here is a detailed overview of the physical properties of arsine:
Atomic and Molecular Properties
Molecular Weight: 76.95 g/mol
Molecular Structure: Arsine has a trigonal pyramidal molecular geometry with a central arsenic atom bonded to three hydrogen atoms.
Physical Properties
Density |
At standard temperature and pressure (STP), the density of arsine is approximately 2.52 g/L, which is heavier than air. |
Melting Point |
-117°C (-179.6°F) at a pressure of 1 atm. |
Boiling Point |
-62.5°C (-80.5°F) at 1 atm. |
Critical Temperature |
232°C (450°F) at a pressure of 48.1 atm (4,850 kPa). |
Critical Pressure |
48.1 atm (4,850 kPa). |
Critical Density |
0.26 g/cm³. |
Solubility
Arsine is soluble in water and reacts with it to form various arsenic compounds. It is also soluble in organic solvents.
Thermal Conductivity
AsH3 has a relatively low thermal conductivity, which is typical for gases, especially those with small molecules.
Viscosity
As a gas, the viscosity of arsine is low and behaves similarly to other gases in this regard.
Reactivity
Arsine is a highly reactive gas and can react with oxygen to form arsenic oxides. It can also react with halogens and other oxidizing agents.
Uses
AsH3 is used in the semiconductor industry for the growth of certain types of crystals and in the doping of semiconductors.
Safety
Arsine is highly toxic and can cause severe health effects, including death, upon inhalation or ingestion.
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