Chemical elements
  Bismuth
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Bismuth Trihydride
      Bismuth Trifluoride
      Bismuthyl Fluoride
      Bismuth Trichloride
      Bismuth Oxychloride
      Bismuth Chlorate
      Bismuthyl Perchlorates
      Bismuth Thiochloride
      Bismuth Selenochloride
      Bismuth Dibromide
      Bismuth Tribromide
      Bismuth Oxybromide
      Bismuth Thiobromide
      Bismuth Diiodide
      Bismuth Triiodide
      Bismuth Oxyiodide
      Bismuth Iodate
      Bismuth Thioiodide
      Bismuth Monoxide
      Bismuth Trioxide
      Bismuth Hydroxide
      Bismuth Tetroxide
      Bismuth Pentoxide
      Bismuth Hexoxide
      Bismuth Monosulphide
      Bismuth Trisulphide
      Bismuth Sulphites
      Bismuth Sulphate
      Bismuth Thiosulphates
      Bismuth Triselenide
      Bismuth Chromite
      Bismuth Nitride
      Bismuthyl Nitrite
      Normal Bismuth Nitrate
      Basic Bismuth Nitrate
      Bismuth Phosphide
      Bismuth Hypophosphite
      Bismuth Phosphite
      Bismuth Orthophosphate
      Bismuth Pyrophosphate
      Bismuth Thiophosphate
      Bismuth Arsenide
      Bismuth Arsenite
      Bismuth Arsenate
      Bismuth Carbonate
      Bismuth Cyanides
      Bismuth Thiocyanate
      Bismuth Chromothiocyanate
      Bismuth Orthosilicate
    Detection and Estimation

Bismuth Dibromide, BiBr2






The evidence for the existence of Bismuth Dibromide, BiBr2, is as unsatisfactory as that for the existence of the corresponding chlorine compound. Similar methods have been suggested for its preparation, and it is stated to be a brown, or grey, substance, crystallising in needles. Muir thought it probable that a lower bromide was formed by the reduction of the tribromide by hydrogen, but was unable to isolate the substance owing to its instability. Attempts to elucidate this problem by means of thermal investigation have also been undertaken. Herz and Guttmann state that the dibromide is a greyish-black substance with a density of 5.9 and a melting point of 198° C.; while Marino and Becarelli contend that no compound is formed in the system Bi-BiBr3, but a series of solid solutions only. The latter investigators find the system similar to that of Bi-BiCl3, the solid solution undergoing transformation into first a β-form and then a γ-form, the melting point of the γ-form always being higher than that of either bismuth or bismuth tribromide. On fusion and cooling, the γ-crystals decompose and deposit α-crystals of different composition, and two liquid layers are formed.


© Copyright 2008-2012 by atomistry.com