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
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.760 Edit this at Wikidata
EC Number
  • 215-135-2
UNII
  • InChI=1S/2Bi.3Te/q2*+3;3*-2 checkY
    Key: AZFMNKUWQAGOBM-UHFFFAOYSA-N checkY
  • InChI=1/2Bi.3Te/q2*+3;3*-2
    Key: AZFMNKUWQAGOBM-UHFFFAOYAF
  • [Te-2].[Te-2].[Te-2].[Bi+3].[Bi+3]
Properties
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]
insoluble[1]
Solubility in ethanol soluble[1]
Structure
Trigonal, hR15
R3m, No. 166[2]
a = 0.4395 nm, c = 3.044 nm
3
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
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
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 checkY☒N ?)

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.

  1. ^ 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.
  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.
  3. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0056". National Institute for Occupational Safety and Health (NIOSH).