:Magnesium aluminide

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| Name = $\backslash beta$-Mg₂Al₃

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| Samson phase

| Mg₄₄₈Al₇₂₀

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| Density = 2.235 g/cm³, solid

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| Structure_ref ={{cite journal | last=Samson | first=S. | title=The crystal structure of the phase β Mg2Al3 | journal=Acta Crystallographica | publisher=International Union of Crystallography (IUCr) | volume=19 | issue=3 | date=1965-09-01 | issn=0365-110X | doi=10.1107/s0365110x65005133 | pages=401–413| bibcode=1965AcCry..19..401S }}

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| SpaceGroup = Fd{{overline|3}}m (No. 227)

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| LattConst_a = 2823.9 pm

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Magnesium aluminide is an intermetallic compound of magnesium and aluminium. Common phases (molecular structures) include the beta phase (Mg₂Al₃) and the gamma phase (Mg₁₇Al₁₂), which both have cubic crystal structures. Magnesium aluminides are important constituents of 5XXX aluminium alloys (aluminium-magnesium) and magnesium-aluminium alloys, determining many of their engineering properties. Due to the advantage of low density and being strong, magnesium aluminide is important for aircraft engines.{{Cite book|last=Rayner-Canham, Geoffrey|url=https://www.worldcat.org/oclc/882867766|title=Descriptive inorganic chemistry|others=Overton, Tina|date=22 December 2013|isbn=978-1-4641-2557-7|edition= Sixth|location=New York, NY|oclc=882867766}} MgAl has also been investigated for use as a reactant to produce metal hydrides in hydrogen storage technology. Like many intermetallics, MgAl compounds often have unusual stoichiometries with large and complex unit cells.

$\backslash beta$-Mg₂Al₃ is a complex metallic alloy which crystallizes in cubic unit cell with 1168 atoms per cell. If the Wyckoff positions were fully occupied, the structure would have 1832 atoms, but the sites are only partially occupied. The structure has very low density, and has been suggested for use in hydrogen storage.{{cite journal | last=Steurer | first=Walter | title=The Samson phase, β-Mg₂Al₃, revisited | journal=Zeitschrift für Kristallographie | publisher=Walter de Gruyter GmbH | volume=222 | issue=6 | year=2007 | issn=0044-2968 | doi=10.1524/zkri.2007.222.6.259 | pages=259–288| bibcode=2007ZK....222..259S | doi-access=free }}