Aluminium nitride

Aluminium nitride

Names
IUPAC name Aluminium nitride
Other names AlN
Identifiers
CAS Number	24304-00-5 Y
3D model (JSmol)	Interactive image Interactive image
ChEBI	CHEBI:50884 Y
ChemSpider	81668 Y
ECHA InfoCard	100.041.931
EC Number	246-140-8
Gmelin Reference	13611
PubChem CID	90455
RTECS number	BD1055000
UNII	7K47D7P3M0 Y
CompTox Dashboard (EPA)	DTXSID8066977
SMILES [AlH2-]1[N+]47[AlH-]2[N+][AlH-]3[N+]8([AlH2-][NH+]([AlH2-]4)[AlH2-]6)[AlH-]4[N+][AlH-]5[N+]6([AlH2-]6)[Al-]78[N+]78[AlH-]([NH+]69)[NH+]5[AlH2-][NH+]4[AlH-]7[NH+]3[AlH2-][NH+]2[AlH-]8[NH+]1[AlH2-]9 [AlH2-]1[NH+]([AlH2-]6)[AlH2-][NH+]7[AlH-]2[N+][Al-]3([N+][AlH-]9[N+]5)[N+]18[Al-]45[N+][AlH-]5[NH+]6[Al-]78[N+]78[AlH2-][NH+]5[AlH2-][N+]4([AlH2-][NH+]9[AlH2-]4)[AlH-]7[N+]34[AlH2-][NH+]2[AlH2-]8
Properties
Chemical formula	AlN
Molar mass	40.989 g/mol[1]
Appearance	white to pale-yellow solid
Density	3.255 g/cm3[1]
Melting point	2,500 °C (4,530 °F; 2,770 K)[2]
Solubility in water	hydrolyses (powder), insoluble (monocrystalline)
Solubility	insoluble, subject of hydrolysis in water solutions of bases and acids [3]
Band gap	6.015 eV[4][5] (300 K, direct)
Electron mobility	~300 cm2/(V·s)
Thermal conductivity	321 W/(m·K)[6]
Refractive index (nD)	2.048[7]（300 k, λ = 633 nm）
Structure[8]
Crystal structure	Wurtzite (Atmospheric)
Space group	C6v4-P63mc, No. 186, hP4
Lattice constant	a = 0.31117 nm [9] , c = 0.49788 nm
Formula units (Z)	2
Coordination geometry	Tetrahedral
Structure[10]
Crystal structure	Rocksalt (High-pressure)
Space group	${\displaystyle O_{h}^{5}{\text{-}}Fm{\overline {3}}m}$, No. 225, cF8
Lattice constant	a = 0.3938 nm
Formula units (Z)	4
Thermochemistry
Std enthalpy of formation ΔfHo298	−318.0 kJ/mol
Standard molar entropy So298	20.2 J/(mol·K)
Specific heat capacity, C	30.1 J/(mol·K)
Hazards
GHS labelling:
Pictograms	‍‍
Signal word	Warning
Hazard statements	H315, H319, H335, H373, H411
Precautionary statements	P260, P264, P271, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P332+P313, P337+P313, P362, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 0 0
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

Aluminium nitride is a chemical compound made of aluminium and nitride ions. The chemical formula is AlN. It is a semiconductor with a wide bandgap of 6 eV, similar to boron nitride. It has a weak piezoelectric effect that can be made stronger by adding small amounts of metals like scandium.^[11]

It is used in thermal management and electronic applications if there is high thermal conductivity and electronic insulation required. It is can sometimes be an alternative to beryllium oxide because it is not a health hazard when it is machined, unlike beryllium oxide.^[12]