What is Aluminium arsenide?
{{chembox | Name = Aluminium arsenide | ImageFile = Boron-phosphide-unit-cell-1963-CM-3D-balls.png | ImageSize = | ImageName = | OtherNames = | Section1 = {{Chembox Identifiers | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 81112 | InChI = 1/Al.As/rAlAs/c1-2 | SMILES = [Al]#[As] | InChIKey = MDPILPRLPQYEEN-LYSWLDLJAW | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/Al.As | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = MDPILPRLPQYEEN-UHFFFAOYSA-N | CASNo = 22831-42-1 | CASNo_Ref = {{cascite|correct|CAS}} | PubChem = 89859 }} | Section2 = {{Chembox Properties | Formula = AlAs | MolarMass = 101.9031 g/mol | Appearance = orange crystals | Density = 3.72 g/cm<sup>3</sup> | Solubility = | MeltingPt = 1740 °C (2013 K) | BandGap = 2.12 eV (indirect)<ref name=ioffe>{{cite web | url = http://www.ioffe.ru/SVA/NSM/Semicond/AlGaAs/index.html | work = Ioffe Database | title = Al<sub>x</sub>Ga<sub>1-x</sub>As | publisher = FTI im. A. F. Ioffe, RAN | location = Sankt-Peterburg }}</ref> | ElectronMobility = 200 cm<sup>2</sup>/(V·s) (300 K) | ThermalConductivity = 0.9 W/(cm·K) (300 K) | RefractIndex = 3 (infrared) }} | Section3 = {{Chembox Structure | Coordination = Tetrahedral | CrystalStruct = [[Zincblende (crystal structure)|Zinc Blende]] | SpaceGroup = ''T''<sup>2</sup><sub>d</sub>-''F''-4''3m'' }} | Section7 = {{Chembox Hazards | EUClass = | NFPA-H = | NFPA-F = | NFPA-R = | RPhrases = | SPhrases = }} | Section8 = {{Chembox Related | OtherAnions = | OtherCations = | OtherFunctn = [[Aluminium gallium arsenide]], [[Aluminium indium arsenide]], [[Aluminium antimonide]], [[Boron arsenide]] | Function = semiconductor materials | OtherCpds = }} }} '''Aluminium arsenide''' is a [[chemical compound]]. Its [[chemical formula]] is AlAs. It has [[aluminium]] and [[arsenide]] [[ion]]s in it. ==Properties and preparation== Aluminium arsenide is an orange [[solid]]. It is toxic because it has [[arsen