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Silicon Carboxide

The compound (SiCO)x is formed when silicon is heated to whiteness in an atmosphere of carbon dioxide:

3Si + 2CO2 = SiO2 + 2SiCO.

After the removal of silica with hydrofluoric acid the carboxide remains as a greenish white powder, which is stable towards alkalis.

A product called Siloxicon has been prepared by Colson, and is manufactured by the Acheson Company at Niagara, by heating a mixture of sand, powdered coke, and sawdust in the electric furnace to a temperature not exceeding 2800° C. The reaction is approximately

2SiO2 + 5C = Si2C2O + 3CO,

but the product is a mixture, and may contain other bodies besides Si2C2O, e.g. C7Si7O, if the proportion of carbon to silica is varied. Siloxicon is refractory, and greyish green when cold, but light yellow above 300° F.; its density is 2.73, and it binds when ground with water and fired.

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