Silicon sulfide

Silicon (IV ) sulphide

White solid with odor of rotten eggs

Fixed

2.02 g · cm -3

1090 ° C ( sublimation)

Decomposition in water

Risk

Template: Infobox chemical / molecular formula search available

Siliciumdisulfid is an inorganic chemical compound of silicon selected from the group of the sulfides.

Occurrence

It is believed that Siliciumdisulfid occurs in circumstellar shells.

Production and representation

Siliciumdisulfid can be obtained by reaction of silicon dioxide with aluminum sulfide at 1200 to 1300 ° C, whereby Silciumonosulfid formed.

Also possible is the preparation by reaction of dry hydrogen sulfide with silicon at 1200 to 1300 ° C, or the thermal decomposition of Tetraethylmercaptosilan Si ( SC2H5 ) 4 at 250 to 300 ° C. Also, when melted together at 1000 ° C of the elements is formed.

Properties

Siliciumdisulfid is a moisture-sensitive, white, fibrous mass, which is very sensitive to moisture and decomposes in water, ethanol and ammonia.

When heated in air, it burns slowly. It does not have as silica has a spatial network, but a fibrous structure with a distorted tetrahedral coordinated silicon atoms. It is a distorted cubic close packing of spheres in each quarter of the tetrahedral holes is occupied by silicon atoms. It is an orthorhombic crystal structure with space group Ibam. While heating under pressure, this merges into a cristobalite -like modification.