Tribariumdiarsenid

BARIUM ARSENIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  Barium arsenide has the molecular formula of Ba3As2. By passing arsine over barium oxide, at red heat, a mixture of arsenide and arsenite is obtained. The best way is to react the elements together at red heat:
  3Ba + 2Ar ? Ba3As2
  Since Ba metal melts at 729 °C, the metal is melted at 750 °C and vapors of As are passed over it in a stream of argon gas. Crystals of Ba3As2 slowly form in cooler parts of the enclosed tube furnace. It can also be prepared in a pure form by reduction of bariumarsenate with carbon in an electric furnace:
  2Ba3AsO4 + 3C + heat ? Ba3As2 + 3BaO + 2CO2 + CO
  The oxide produced may be removed by washing in an acid like HCl to solubilize it. The crystals obtained are deep brown with a density of 4.16 g/cm³. Its molecular weight is 561.9324 g/mol.

• Chemische Eigenschaften

  brown; 6mm pieces and smaller [CRC10] [CER91]

• Physikalische Eigenschaften

  Barium arsenide is very similar in chemical properties to the arsenides of calcium and strontium. It is slightly darker in color, more readily fusible and more reactive chemically. It burns spontaneously in fluorine, chlorine or bromine vapor. In oxygen, it burns at about 300°C to form the orthoarsenate and in sulfur vapor at dull red heat to form thioarsenates. Ba3As2 has the body-centered cubic structure with a = 9.846?, where 1/9 of the anion sites are empty.
  Barium arsenide also forms double salts such as Li4Ba3As4 (Orthorhombic space group = Immm) which is isostructural with Li4Sr3Sb4 and Li4Ba3Sb4. It contains two anionic moieties, namely As2^4- dumbbells and As^3-, and consists of planes of BaAs6 octahedra separated by corrugated sheets of Li and Ba atoms.

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