Antimony trisulfide (Sb2S3)

Structure and properties

Sb2S3 is a covalent, polymeric sulfide that typically forms needlelike or fibrous crystals in nature. It is poorly soluble in water and is chemically stable under many conditions, but it will react with strong oxidizers and certain acids. The compound behaves as a semiconductor and has been subject to research for optoelectronic applications.

History and occurrence

The most familiar form of antimony trisulfide is stibnite, a lead-gray to black mineral that has been mined for centuries. Stibnite ores provided antimony metal and were also ground to produce cosmetics such as ancient kohl. For information on the metallic element see antimony.

Uses and applications

Historically and today, Sb2S3 has several practical uses. Key applications include:

• Traditional cosmetics and pigments derived from naturally occurring mineral.
• Pyrotechnics and match compositions, where it serves as a fuel and intensifies certain flame colors.
• Specialty photographic and metallurgical roles, and as a precursor in some industrial processes.
• Research into thin-film photovoltaics and infrared detectors where its semiconducting properties are of interest.

Distinctions and safety

Antimony trisulfide is distinct from antimony oxides (such as Sb2O3), which are used mainly as flame retardants; sulfide chemistry leads to different optical and electronic behavior. Sulfur in the compound is present as sulfide anions; for a technical note see sulfide, and for oxidation-state details see oxidation state. Like many antimony compounds, Sb2S3 should be handled with care because antimony compounds can be toxic if ingested or inhaled as dust. Proper industrial hygiene and disposal practices are recommended.