Aluminium antimonide

Aluminium antimonide (AlSb) is a semiconductor of the group III-V family containing aluminium and antimony. The lattice constant is 0.61 nm. The indirect bandgap is approximately 1.6 eV at 300 K, whereas the direct band gap is 2.22 eV.

Aluminium antimonide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.042.410
EC Number
  • 246-667-3
PubChem CID
UNII
  • InChI=1S/Al.Sb Y
    Key: LVQULNGDVIKLPK-UHFFFAOYSA-N Y
  • InChI=1/Al.Sb/rAlSb/c1-2
    Key: LVQULNGDVIKLPK-XFZGNPHIAJ
SMILES
  • [SbH+]12[Al-][SbH+]3[Al-][SbH+]([AlH-]14)[AlH-]1[Sb+]5([AlH-]38)[Al-]26[SbH+]2[AlH-]([Sb+]4)[SbH+]1[Al-][SbH+]3[AlH-]2[Sb+][AlH-]([SbH+]6[AlH-]([SbH+])[SbH+]68)[SbH+]([Al-]6)[AlH-]35
Properties
AlSb
Molar mass 148.742 g/mol
Appearance black crystals
Density 4.26 g/cm3
Melting point 1,060 °C (1,940 °F; 1,330 K)
Boiling point 2,467 °C (4,473 °F; 2,740 K)
insoluble
Band gap 1.58 eV
Refractive index (nD)
 3.3
Structure
Zinc blende
Space group
 T2d-F-43m
Tetrahedral
Thermochemistry
Std molar
entropy (S⦵298)
 65 J/mol K
Std enthalpy of
formation (ΔfH⦵298)
 -50.4 kJ/mol
Hazards
NFPA 704 (fire diamond)
0
3
1
317 °C (603 °F; 590 K)
Safety data sheet (SDS) MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Its electron mobility is 200 cm2·V−1·s−1 and hole mobility 400 cm2·V−1·s−1 at 300 K. Its refractive index is 3.3 at a wavelength of 2 μm, and its dielectric constant is 10.9 at microwave frequencies.

AlSb can be reacted with other III-V materials to produce ternary materials including AlInSb, AlGaSb and AlAsSb.

Aluminium antimonide is rather flammable because of the reducing tendency of the antimonide (Sb3−) ion. It burns to produce aluminium oxide and antimony trioxide.

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