Bismuth telluride

Bismuth telluride
	; Single crystal of bismuth telluride
	; Atomic structure: ideal (l) and with a twin defect (r)
	; Electron micrograph of twinned bismuth telluride
Identifiers
CAS Number	1304-82-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	11278988 ;
ECHA InfoCard	100.013.760
EC Number	215-135-2;
PubChem CID	6379155;
UNII	1818R19OHO ;
CompTox Dashboard (EPA)	DTXSID90894839 ;
	InChI InChI=1S/2Bi.3Te/q2+3;3-2 Key: AZFMNKUWQAGOBM-UHFFFAOYSA-N ; InChI=1/2Bi.3Te/q2+3;3-2 Key: AZFMNKUWQAGOBM-UHFFFAOYAF;
	SMILES [Te-2].[Te-2].[Te-2].[Bi+3].[Bi+3];
Properties
Chemical formula	Bi2Te3
Molar mass	800.76 g·mol−1
Appearance	Grey powder or metallic grey crystals
Density	7.74 g/cm3
Melting point	580 °C (1,076 °F; 853 K)
Solubility in water	insoluble
Solubility in ethanol	soluble
Structure
Crystal structure	Trigonal, hR15
Space group	R3m, No. 166
Lattice constant	a = 0.4395 nm, c = 3.044 nm
Formula units (Z)	3
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	noncombustible
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp) (pure) ; none (doped with selenium sulfide)
REL (Recommended)	TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) (pure) TWA 5 mg/m3 (doped with selenium sulfide)
IDLH (Immediate danger)	N.D. (pure and doped)
Safety data sheet (SDS)	Sigma-Aldrich
Related compounds
Other anions	Bismuth(III) oxide; Bismuth trisulfide; Bismuth selenide;
Other cations	Arsenic telluride; Antimony telluride
	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

Bismuth telluride (Bi₂Te₃) is a gray powder that is a compound of bismuth and tellurium also known as bismuth(III) telluride. It is a semiconductor, which, when alloyed with antimony or selenium, is an efficient thermoelectric material for refrigeration or portable power generation. Bi₂Te₃ is a topological insulator, and thus exhibits thickness-dependent physical properties.

^ ^a ^b ^c ^d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.52. ISBN 1-4398-5511-0.
^ Feutelais, Y.; Legendre, B.; Rodier, N.; Agafonov, V. (1993). "A study of the phases in the bismuth – tellurium system". Materials Research Bulletin. 28 (6): 591. doi:10.1016/0025-5408(93)90055-I.
^ ^a ^b ^c ^d NIOSH Pocket Guide to Chemical Hazards. "#0056". National Institute for Occupational Safety and Health (NIOSH).

[b92-1] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.52. ISBN 1-4398-5511-0.

[str-2] Feutelais, Y.; Legendre, B.; Rodier, N.; Agafonov, V. (1993). "A study of the phases in the bismuth – tellurium system". Materials Research Bulletin. 28 (6): 591. doi:10.1016/0025-5408(93)90055-I.

[PGCH-3] NIOSH Pocket Guide to Chemical Hazards. "#0056". National Institute for Occupational Safety and Health (NIOSH).

[1]

[2]

[3]

Identifiers
Single crystal of bismuth telluride
Atomic structure: ideal (l) and with a twin defect (r)
Electron micrograph of twinned bismuth telluride
CAS Number	1304-82-1^Y
3D model (JSmol)	Interactive image
ChemSpider	11278988^Y
ECHA InfoCard	100.013.760
EC Number	215-135-2
PubChem CID	6379155
UNII	1818R19OHO^Y
CompTox Dashboard (EPA)	DTXSID90894839
InChI InChI=1S/2Bi.3Te/q2+3;3-2^Y Key: AZFMNKUWQAGOBM-UHFFFAOYSA-N^Y InChI=1/2Bi.3Te/q2+3;3-2 Key: AZFMNKUWQAGOBM-UHFFFAOYAF
SMILES [Te-2].[Te-2].[Te-2].[Bi+3].[Bi+3]
Properties
Chemical formula	Bi₂Te₃
Molar mass	800.76 g·mol⁻¹
Appearance	Grey powder or metallic grey crystals
Density	7.74 g/cm³^[1]
Melting point	580 °C (1,076 °F; 853 K)^[1]
Solubility in water	insoluble^[1]
Solubility in ethanol	soluble^[1]
Structure
Crystal structure	Trigonal, hR15
Space group	R3m, No. 166^[2]
Lattice constant	a = 0.4395 nm, c = 3.044 nm
Formula units (Z)	3
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	noncombustible^[3]
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m³ (total) TWA 5 mg/m³ (resp) (pure) none (doped with selenium sulfide) ^[3]
REL (Recommended)	TWA 10 mg/m³ (total) TWA 5 mg/m³ (resp) (pure) TWA 5 mg/m³ (doped with selenium sulfide)^[3]
IDLH (Immediate danger)	N.D. (pure and doped)^[3]
Safety data sheet (SDS)	Sigma-Aldrich
Related compounds
Other anions	Bismuth(III) oxide Bismuth trisulfide Bismuth selenide
Other cations	Arsenic telluride Antimony telluride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references