Trimagnesiumdiarsenid

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Achtung

• Gefahrenhinweise

  H301：Giftig bei Verschlucken.

  H331：Giftig bei Einatmen.

  H400：Sehr giftig für Wasserorganismen.

  H410：Sehr giftig für Wasserorganismen mit langfristiger Wirkung.

• Sicherheit

  P261：Einatmen von Staub vermeiden.

  P304+P340：BEI EINATMEN: Die Person an die frische Luft bringen und für ungehinderte Atmung sorgen.

  P405：Unter Verschluss aufbewahren.

MAGNESIUM ARSENIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  Magnesium arsenide has the molecular formula of Mg3As2 and the molecular weight of 223.6592 g/mol. It may be prepared by direct reaction between the elements. Since As sublimes at 614°C and Mg melts at 650°C, the latter is melted at about 675°C in an inert atmosphere like argon (not N2 which would form nitrides) and arsenic vapors are carried into the reaction zone by a stream of Ar gas:
  3Mg + 2As + heat ? Mg3As2
  Mg3As2 is obtained by this method as a deep-brown, X-ray amorphous powder. Magnesium arsenide has the CAS number of 12044-49-4. This compound decomposes in contact with water:
  Mg3As2 + 3H2O ? 2AsH3 + 3Mg(OH)2
  Thus, it must be stored under dry conditions. Its density is 3.15 g/cm³. This compound is dimorphic with the low temperature form, β-Mg3As2 being cubic (α = 12.33?) and the high-temperature form, α-Mg3As2 being hexagonal. It crystallizes in the anti-La2O3 crystal structure, with unit-cell parameters of: a = 4.264A ° , c = 6.738?, c/a = 1.580. Both of these compounds are semiconductors. The latter has a band gap, E_g, of 2.2eV (564 nm).

• Verwenden

  The structure of magnesium arsenide is not ionic but covalent. Magnesium arsenide was used as a rodenticide and insecticide. Its toxicity to humans has led to its prohibition in the US and Europe.

Trimagnesiumdiarsenid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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