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
CAS Number	25152-52-7 Y
3D model (JSmol)	Interactive image
ChemSpider	82452 Y
ECHA InfoCard	100.042.410
EC Number	246-667-3
PubChem CID	91307
UNII	5YY752FD6D Y
CompTox Dashboard (EPA)	DTXSID9067061
InChI 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
Chemical formula	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)
Solubility in water	insoluble
Band gap	1.58 eV
Refractive index (nD)	3.3
Structure
Crystal structure	Zinc blende
Space group	T2d-F-43m
Coordination geometry	Tetrahedral
Thermochemistry
Std molar entropy (So298)	65 J/mol K
Std enthalpy of formation (ΔfH⦵298)	-50.4 kJ/mol
Hazards
Safety data sheet	MSDS
NFPA 704 (fire diamond)	3 0 1
Autoignition temperature	317 °C (603 °F; 590 K)
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.[1]

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

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