MgCu2
Chemical compound
From Wikipedia, the free encyclopedia
MgCu2 is a binary intermetallic compound of magnesium (Mg) and copper (Cu) adopting cubic crystal structure, more specifically the C15 Laves phase.
The crystal structure of MgCu2. Magnesium is shown in green, copper in brown. | |
| Names | |
|---|---|
| IUPAC name
Copper - magnesium (2:1) | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| Cu2Mg | |
| Molar mass | 151.397 g·mol−1 |
| Density | 5.96 g/cm3[1] |
| Melting point | 520 °C (968 °F; 793 K)[2] |
| Structure[1] | |
| Cubic (227) | |
| Fd3m | |
| m3m | |
a = 6.96 Å, b = 6.96 Å, c = 6.96 Å α = 90°, β = 90°, γ = 90° | |
Lattice volume (V) |
337.49 Å |
Formula units (Z) |
8 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
MgCu2 can be prepared by hydrogenation of Mg2Cu:[3]
- 2 Mg2Cu + 3 H2 → 3 MgH2 + MgCu2
Or by the reaction of magnesium hydride and metallic copper at elevated temperature and pressure:
- MgH2 + 2 Cu → MgCu2 + H2
MgCu2 can also be prepared by heating magnesium and excess copper at about 380 °C (716 °F).[4]
Properties
MgCu2 can react with boron or its oxide to form magnesium borides after mechanical ball milling and heating.[5] It can also react with magnesium hydride to produce orthorhombic Mg2Cu, liberating hydrogen.[6]
