Views: 0 Author: Site Editor Publish Time: 2022-11-25 Origin: Site
Aluminum arsenide is a kind of inorganic compound, chemical formula is AlAs, is orange yellow crystal, when dissolved in acid produces hydrogen arsenide gas, commonly used as a spectral analysis reagent and raw material for the preparation of electronic components, is also a new type of semiconductor material.
CAS No. : 22831-42-1
Molecular weight: 101.90
Exact molecular weight: 105.93400
Properties: semiconductor, sphalerite structure.
Density: 3.81 g/mL
Melting point: 1740 ºC
Water-soluble: reacts with water
Appearance: orange crystal
The invention relates to an efficient method for preparing high purity aluminum arsenide. The method adopts vapor deposition method. Under the protection of argon gas, the aluminum trichloride and arsenic trichloride are heated respectively in the volatilization chamber to volatilize into steam, which is sprayed into the reaction chamber through a nozzle to react and generate aluminum arsenide crystal by vapor deposition. The specific steps are as follows:
(1) Using argon as a protective gas, aluminum trichloride and arsenic trichloride were extracted according to the molar mass ratio of 1:1 ~ 1.5:1, respectively in the first volatile chamber 1 and the second volatile chamber 2, and volatilized at 300 ~ 900℃ for 0.5h ~ 12h, so that the two materials were in vapor state;
(2) The aluminum trichloride and arsenic trichloride vapors in the two volatilization chambers were injected into a titanium reaction chamber 3 through the first nozzle 4 and the second nozzle 5 at the same time through the first nozzle 4 and the second nozzle 5 respectively, and the reaction of chemical bookh ~ 5h at 300 ~ 900℃ was conducted to obtain the deposits by vapor deposition; The remaining volatile gas is pressurized to 600 ~ 700kPa at normal temperature or cooled to -34℃ at normal pressure to obtain liquid chlorine.
(3) The obtained sediment was heated for 2h ~ 12h at 300 ~ 900℃ and pressure of 0.5 ~ 100KPa. The residual chlorine was removed and cooled to obtain orange crystal aluminum arsenide with purity greater than 99.9%. The first volatile chamber 1 and the second volatile chamber 2 can adopt the metal heating volatile equipment of the existing technology, such as the side-blowing electric furnace, and connect the nozzle of the opposite reaction chamber in the eye of the electric furnace. The reaction chamber can also use electric heating furnace, vapor deposition to get sediment; The remaining volatile gas is extracted from the reaction chamber, which is pressurized to 600 ~ 700kPa at normal temperature or cooled to -34℃ at normal pressure to obtain liquid chlorine.
It will not decompose if used and stored according to specifications
Avoid exposure to acids
The dielectric constant is 10.3.
Band gap 2.13eV(22℃).
Keep the cache sealed
Store in a tight container in a cool, dry place
It is often used as a reagent for spectral analysis and raw material for preparing electronic components. It is also a new type of semiconductor material.