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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.

Quick facts Names, Identifiers ...
MgCu2
The crystal structure of MgCu2. Magnesium is shown in green, copper in brown.
Names
IUPAC name
Copper - magnesium (2:1)
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/2Cu.Mg
    Key: BSBUOWMDDLTWGL-UHFFFAOYSA-N
  • [Mg].[Cu].[Cu]
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°
337.49 Å
8
  • 12-coordinate at Mg to equivalent Cu atoms.
  • Mixture of corner, edge, and face sharing CuMg6Cu6 cuboctahedra to 6 Mg and 6 Cu at Cu.
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]

References

See also

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