Antimony telluride

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Antimony telluride

Electron micrograph of a seamless Bi2Te3/Sb2Te3 heterojunction and its atomic model (blue: Bi, green: Sb, red: Te)[1]
Names
Other names
antimony telluride, antimony(III) telluride, antimony telluride, diantimony tritelluride
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.014.074 Edit this at Wikidata
  • InChI=1S/2Sb.3Te/q2*+3;3*-2 checkY
    Key: RSPNQEPAQCYWKS-UHFFFAOYSA-N checkY
  • InChI=1/2Sb.3Te/q2*+3;3*-2
    Key: RSPNQEPAQCYWKS-UHFFFAOYAT
  • [Te]=[Sb][Te][Sb]=[Te]
  • [Sb+3].[Sb+3].[Te-2].[Te-2].[Te-2]
Properties
Sb2Te3
Molar mass 626.32 g·mol−1
Appearance grey solid
Density 6.50 g cm−3[2][3]
Melting point 620 °C (1,148 °F; 893 K)[2]
Band gap 0.21 eV[4]
Thermal conductivity
 1.65 W/(m·K) (308 K)[5]
Structure
Rhombohedral, hR15
R3m, No. 166[6]
a = 0.4262 nm, c = 3.0435 nm
3
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.5 mg/m3 (as Sb)[7]
REL (Recommended)
 TWA 0.5 mg/m3 (as Sb)[7]
Related compounds
Other anions
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).
checkY verify (what is checkY☒N ?)

Antimony telluride is an

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.[1]

Crystalline structure

Sb2Te3 has a rhombohedral crystalline structure.[8] The crystalline material comprises atoms covalently bonded to form 5 atom thick sheets (in order: Te-Sb-Te-Sb-Te), with sheets held together by van der Waals attraction. Due to its layered structure and weak inter-layer forces, bulk antimony telluride may be mechanically exfoliated to isolate single sheets.

Synthesis

Although antimony telluride is a naturally occurring compound, select stoichiometric compounds may be formed by the reaction of antimony with tellurium at 500–900 °C.[3]

2 Sb(l) + 3 Te(l) → Sb2Te3(l)

Applications

Like other

p-type semiconductors by doping with an appropriate dopant.[3]

Doping Sb2Te3 with iron introduces multiple Fermi pockets, in contrast to the single frequency detected for pure Sb2Te3, and results in reduced carrier density and mobility.[9]

Sb2Te3 forms the

pseudobinary intermetallic system germanium-antimony-tellurium with germanium telluride, GeTe.[10]

Like

solid state refrigerators.[3]

References

Wikimedia Commons has media related to Antimony telluride.
  1. ^
    PMID 26572278
    .
  2. ^
    ISBN 1-4398-5511-0
    .
  3. ^
    ISBN 978-0-08-037941-8
    .
  4. PMID 10035559
    .
  5. PMID 9981020
    .
  6. doi:10.1016/S0925-8388(96)02709-0
    .
  7. ^ a b NIOSH Pocket Guide to Chemical Hazards. "#0036". National Institute for Occupational Safety and Health (NIOSH).
  8. doi:10.1107/S0567740874004729
    .
  9. S2CID 119401198
    .
  10. doi:10.1016/S1369-7021(08)70118-4
    .
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