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Names | |
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IUPAC name
Pentamagnesium digallide
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Other names
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Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
Mg5Ga2 | |
Molar mass | 260.97 g/mol |
Appearance | White crystalline solid |
Density | 3.08 g/cm3 |
Melting point | 456 °C (853 °F; 729 K) |
Structure | |
Orthorhombic | |
Ibam | |
mmm | |
a = 13.71 Å, b = 7.02 Å, c = 6.02 Å
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Lattice volume (V)
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579.06 Å3 |
Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
-206.5 kJ/mol (calculated) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Pentamagnesium digallide, also known as magnesium gallide(−V), is a chemical compound in the family of magnesium gallides (MgxGay). This compound has gallium in the rare oxidation state −5 and is produced by splat quenching of a molten mixture of magnesium and gallium metal then heating the resulting substance to 350 °C:[1][2]
It is an unwanted product when magnesium-gallium alloys are exposed to high temperatures.[3]