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Static magnetic properties of the many-sublattice antiferromagnet Ca2Fe2O5.

We have studied the magnetization of the antiferromagnet dicalcium ferrite Ca 2 Fe 2 O 5 in magnetic fields up to 5.5 T and in the temperature range 5-330 K. Temperature dependences of the weak ferromagnetic moment m 0 and susceptibilities along the main crystallographic axes have been measured. Effective intrinsic parameters, such as an exchange field and the Dzyaloshinskiy-Moriya field have been obtained as a function of temperature. Possible magnetic structures have been analyzed by means of comprehensive group-theoretical consideration and a phenomenological free energy has been derived