Chemical elements
    Physical properties
    Chemical properties
      Gallium dichloride
      Gallium trichloride
      Gallium sesqui-oxide
      Gallium hydroxide
      Gallium sulphide
      Gallium sulphate
      Gallium ammonium alum
      Gallium Silicotungstate
      Gallium nitrate
    PDB 1cfw-2kt4

Gallium sesqui-oxide, Ga2O3

Gallium sesqui-oxide, Ga2O3, which may be prepared by igniting the hydroxide or nitrate, is a white mass, infusible at a red heat. Its specific heat (0° to 100°) is 0.1062. The strongly ignited oxide resembles ignited alumina in its resistance to acids and alkalies, and requires to be fused with potassium hydrogen sulphate in order to be brought into solution. At a red heat, hydrogen reduces the sesqui-oxide to a greyish-blue mass, probably a suboxide (GaO ?), which dissolves in dilute mineral acids to form solutions which instantly reduce potassium permanganate. At a bright red heat, reduction to the metal can be effected. Gallium sesqui-oxide is also reduced to gallium when heated with magnesium.

The oxides of samarium, dysprosium, terbium, and chromium act as phosphorogens when diluted with gallium sesqui-oxide and submitted to the action of cathode rays. The phosphorescence is a beautiful red when the quantity of chromium sesqui-oxide equals 0.1 per cent.

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