Titanium disulfide

Green powder with odor of rotten eggs

Fixed

3.22 g · cm -3

Reacts with water to release hydrogen sulfide

Attention

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Titanium (IV ) sulphide or titanium disulphide is a chemical compound selected from the group consisting of sulfides having the formula TiS2.

Representation

Titanium disulfide can be made ​​of titanium tetrachloride TiCl4 and hydrogen sulfide H2S.

Also possible is the synthesis from the elements.

Properties

Titanium disulfide is a bronze-colored, diamagnetic crystalline powder. The crystals have a layered structure, namely cadmium iodide structure. The sulfur atoms are arranged in a hexagonal closest packing of spheres. The titanium ions occupy the octahedral holes between each over the next anion.

The compound is sensitive to moisture. Contact with water, but especially aqueous acids leads to hydrolysis and formation of hydrogen sulfide and titanium dioxide. The substance is flammable due to the sulfide content, with sulfur dioxide gas. At room temperature, it is stable in air, but is heating in air at about to titanium dioxide. Nitric acid and hot sulfuric acid konzenztrierte it is decomposed to sulfur deposition. From boiling caustic soda and caustic potash it is resolved with the formation of alkali titanate and alkali sulfide.

Titanium disulfide having an electrical conductivity which corresponds to a semi-metal, which when used in batteries has the advantage that no substances such as Carbon black must be added to increase the conductivity.

Titanium disulfide can ( eg, graphite ) to its layer structure reversible lithium store ( intercalation ), where LixTiS2 arises with x between 0 and 1, it is also N- bases such as NH3, N2H4, acid amides can be stored.

Use

Titanium disulfide is used as solid lubricant. It can also be used as an electrode material in lithium batteries or lithium ion batteries, wherein the low atomic weight of titanium is beneficial.