Antimony telluride

Antimony telluride
	; Electron micrograph of a seamless Bi2Te3/Sb2Te3 heterojunction and its atomic model (blue: Bi, green: Sb, red: Te)
Names
	Other names antimony telluride, antimony(III) telluride, antimony telluride, diantimony tritelluride
Identifiers
CAS Number	1327-50-0 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	21241420 ;
ECHA InfoCard	100.014.074
PubChem CID	6369653;
	InChI InChI=1S/2Sb.3Te/q2+3;3-2 Key: RSPNQEPAQCYWKS-UHFFFAOYSA-N ; InChI=1/2Sb.3Te/q2+3;3-2 Key: RSPNQEPAQCYWKS-UHFFFAOYAT;
	SMILES [Te]=[Sb][Te][Sb]=[Te]; [Sb+3].[Sb+3].[Te-2].[Te-2].[Te-2];
Properties
Chemical formula	Sb2Te3
Molar mass	626.32 g·mol−1
Appearance	grey solid
Density	6.50 g cm−3
Melting point	620 °C (1,148 °F; 893 K)
Band gap	0.21 eV
Thermal conductivity	1.65 W/(m·K) (308 K)
Structure
Crystal structure	Rhombohedral, hR15
Space group	R3m, No. 166
Lattice constant	a = 0.4262 nm, c = 3.0435 nm
Formula units (Z)	3
Hazards
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.5 mg/m3 (as Sb)
REL (Recommended)	TWA 0.5 mg/m3 (as Sb)
Related compounds
Other anions	Sb2O3; Sb2S3; Sb2Se3
Other cations	As2Te3; Bi2Te3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Antimony telluride is an inorganic compound with the chemical formula Sb₂Te₃. As is true of other pnictogen chalcogenide layered materials, it is a grey crystalline solid with layered structure. Layers consist of two atomic sheets of antimony and three atomic sheets of tellurium and are held together by weak van der Waals forces. Sb₂Te₃ is a narrow-gap semiconductor with a band gap 0.21 eV; it is also a topological insulator, and thus exhibits thickness-dependent physical properties.

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