Chemical elements
  Indium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Indium Trifluoride
      Indium monochloride
      Indium dichloride
      Indium trichloride
      Indium oxychloride
      Indium monobromide
      Indium tribromide
      Indium oxybromide
      Indium mono-iodide
      Indium di-iodide
      Indium tri-iodide
      Indium perchlorate
      Indium iodate
      Indium sesqui-oxide
      Indium hydroxide
      Indium monosulphide
      Indium disulphide
      Indium sesquisulphide
      Indium trisulphide
      Basic indium sulphite
      Indium sulphate
      Indium sesquiselenide
      Indium selenite
      Indium selenate
      Indium telluride
      Indium silicotungstates
      Indium nitrate
      Indium phosphide
      Indium platinocyanide
      Indium oxalate
      Indium acetylacetonate
    PDB 1ind-1ind

Indium sesqui-oxide, In2O3






Indium sesqui-oxide, In2O3, obtained when indium is heated in air or oxygen, is prepared by the ignition of the hydroxide, carbonate, nitrate, or sulphate. Prepared at fairly low temperatures, it forms a yellow, amorphous powder which is readily soluble in acids, producing indium salts ; but when produced at high temperatures, it forms rhombohedral crystals of the colour of chlorine, and is extremely resistant towards acids. The density is 7.18; the specific heat (0° to 100°), 0.0807. It is diamagnetic.

Indium sesqui-oxide is reduced to indium when heated with sodium, carbon, or magnesium, or when heated in either hydrogen or ammonia; and by carefully regulating the reduction in hydrogen, Winkler claims to have obtained lower oxides, including a black monoxide InO.

When heated above 850°, indium sesqui-oxide loses oxygen and becomes converted into the oxide In3O4, which crystallises in regular octahedra isomorphous with Fe3O4. The loss in weight associated with this change had previously been attributed to the volatility of the sesqui-oxide.

Neither the oxide In3O4 nor the (metastable) In2O3 fuses in the oxy-hydrogen flame

From the data supplied by Ditte the following results may be deduced: -

2[In] + 3(O) = [In2O3] + 239.8 Cals.
[In2O3] + 3H2SO4.aq. = In2(SO4)3.aq. + 72.78 Cals.


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