Chemical elements
    Physical Properties
    Chemical Properties
      Cadmium Fluoride
      Cadmium Chloride
      Cadmium Bromide
      Cadmium Iodide
      Cadmium Chlorate
      Cadmium Perchlorate
      Cadmium Bromate
      Cadmium Iodate
      Cadmium Periodate
      Cadmium Suboxide
      Cadmium Oxide
      Cadmium Hydroxide
      Cadmic Hydroxide
      Cadmium Peroxide
      Cadmium Sulphide
      Cadmium Sulphite
      Cadmium Sulphate
      Cadmium Thiosulphate
      Cadmium Dithionate
      Cadmium Selenide
      Cadmium Selenites
      Cadmium Selenate
      Cadmium Telluride
      Cadmium Tellurite
      Cadmium Tellurate
      Cadmium Chromite
      Cadmium Chromate
      Cadmium Dichromate
      Cadmium Molybdate
      Cadmium Tungstate
      Cadmium Nitride
      Cadmium Azide
      Cadmium Amide
      Cadmium Nitrite
      Cadmium Nitrate
      Cadmium Phosphide
      Cadmium Hypophosphite
      Cadmium Orthophosphate
      Cadmium Pyrophosphate
      Cadmium Thiophosphates
      Cadmium Arsenide
      Cadmium Arsenite
      Cadmium Arsenates
      Cadmium Metantimonate
      Cadmium Carbonate
      Cadmium Thiocarbonate
      Cadmium Cyanide
      Cadmium Silicate
      Cadmium Borates
    PDB 1a4k-1exq
    PDB 1f48-1ihu
    PDB 1ii0-1mhu
    PDB 1mms-1qvg
    PDB 1qy0-1wb6
    PDB 1wje-2avp
    PDB 2b3p-2j6e
    PDB 2jdz-2x05
    PDB 2x09-3ccj
    PDB 3ccl-3ggf
    PDB 3h1u-3p5v
    PDB 3p5w-8ice

Cadmium Suboxide

There is good evidence for the existence of Cd4O as an amorphous green powder, and of Cd2O both as an amorphous green powder and as small yellow crystals.

March and obtained a green product, which he regarded as Cd2O, by heating cadmium oxalate to the melting-point of lead. Since dilute acetic acid dissolved part of it and left a residue of metallic cadmium, subsequent workers regarded his product as a mixture of cadmium and its normal oxide, CdO.

According to Tanatar, amorphous green Cd4O is formed when cadmium oxalate is carefully heated in an atmosphere of dry carbon dioxide, which is converted into a yellowish-brown mixture of cadmium and cadmic oxide by heating to the melting-point of the metal. Denham says that if the metallic cadmium, which is always formed during the reaction, is distilled off in vacuo, green amorphous Cd4O is obtained, but it never amounts to more than 4 per cent, by weight of the original oxalate.

Tanatar and Levin obtained dark green Cd3O2 and Cd2O by heating cadmium oxalate and cadmic oxide in appropriate proportions. Either oxide, when heated in the absence of air, was converted into a mixture of metal and normal oxide. Denham, using this method and finally distilling off metallic cadmium under reduced pressure, obtained some homogeneous green Cd2O.

Hydrogen reduces heated cadmium oxide either to metal or to metal containing unchanged oxide.

When cadmium oxide is reduced by carbon monoxide in the heat, there is a distinct lessening of the velocity of reduction at a point corresponding to the formation of Cd2O, but the lower oxide could not be isolated from this reaction.

When the compounds Cd4Cl7, Cd4Br7, or Cd12I23 are treated with water, the normal halogen compounds and cadmous hydroxide, CdOH, are produced. Minute yellow translucent crystals of Cd2O are obtained by heating this cadmous hydroxide in a current of dry nitrogen. When strongly heated it gives a green mixture of cadmium and cadmic oxide, and it acts as a strong reducing agent towards acids. Denham could not convert more than 5 per cent, of the original chloride into suboxide.

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