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 to 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.
Cubic CoGe is an antiferromagnet with a transition temperature Tc of 132 K.
References
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. Bibcode:1988JSSCh..73...40T. doi:10.1016/0022-4596(88)90051-5. /wiki/Bibcode_(identifier) ↩
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. Bibcode:1988JSSCh..73...40T. doi:10.1016/0022-4596(88)90051-5. /wiki/Bibcode_(identifier) ↩