Concerning one mechanism of the phase transition from the ferromagnetic into the ferrimagnetic state
Kovtun N.M., Kalinnikov V.T., Shemyakov A.A. , Propkopenko V.K., Babitsyna A.A.
A phase transition from the ferromagnetic to the ferrimagnetic state was observed in CuCr chalcogenide spinels. It is due to electron ordering of the Cr3+ and Cr4* ions with simultaneous redistribution of the electrons among the Cu+ and Cr4^ ions.