MAGNESIUM TELLURIDE

MAGNESIUM TELLURIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  Magnesium telluride has the molecular formula of MgTe and the molecular weight of 151.9146 g/mol. It can be prepared by heating the elements together in an inert atmosphere:
  Mg+ Te+ heat ? MgTe
  Te melts at 450°C and Mg melts at 650°C. A heating temperature of 750°C is sufficient to cause complete reaction.MgTe powder can also be prepared by reaction of stoichiometric quantities of Mg and Te in a pure graphite crucible in vacuum at 480°C during 48 h. MgTe single crystals were grown by vacuum sublimation in a two-zone furnace at a sublimation temperature of 960°C. The crystals are transparent hexagonal columns with a length up to 12 mm and extremely hygroscopic. They have a high index of refraction. The lattice parameters are: a=4,5303 ? , c=7.4056? and the band gap, E_g= 3.49 eV. MgTe is a direct gap semiconductor. It tends toward p-type conductivity and very high concentrations above 1021 have been achieved.

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