Cobalt germanide

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Cobalt germanide
MnSi lattice2.png
Structures of left-handed and right-handed cubic CoGe crystals (3 presentations, with different numbers of atoms per unit cell; orange atoms are Ge)
IUPAC name
Cobalt germanide
3D model (JSmol)
  • InChI=1S/Co.Ge
  • [Co].[Ge]
Molar mass 131.56 g/mol
1.3×10−6 emu/g[1]
C2/m (No. 12), mS16
a = 1.165 nm, b = 0.3807 nm, c = 0.4945 nm
α = 90°, β = 101.1°, γ = 90°
Flash point Non-flammable
Related compounds
Other anions
Cobalt silicide
Other cations
Iron germanide
Manganese germanide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cobalt germanide (CoGe) is an intermetallic compound, a germanide of cobalt.

Cubic CoGe crystals (space group P213, cP8, a = 0.4631 nm) can be produced by processing a mixture of Co and Ge powders at a pressure of 4 GPa and a temperature of 800–1000 °C for 1–3 hours. They have no inversion center, and are therefore helical, with right-hand and left-handed chiralities. The cubic CoGe is metastable, and converts into a monoclinic phase upon subsequent heating to 600 °C at ambient pressure.[1]

Cubic CoGe is an antiferromagnet with a transition temperature Tc of 132 K.[1]


  1. ^ a b c d Takizawa, H.; Sato, T.; Endo, T.; Shimada, M. (1988). "High-pressure synthesis and electrical and magnetic properties of MnGe and CoGe with the cubic B20 structure". Journal of Solid State Chemistry. 73 (1): 40–46. doi:10.1016/0022-4596(88)90051-5.