Crystal structure and magnetic properties of Bi1−x Ca x Fe1−x Mn(Ti) x O3 ceramics across the phase boundary
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Crystal structure and magnetic properties of BiFeO3 compounds co-doped with Ca and Mn ions as well as Ca and Ti ones were studied using diffraction and magnetometry techniques. Crystal structure of the Bi1−x Ca x Fe1−x Mn x O3 ceramics with x < 0.19 was attested to be single phase rhombohedral one, structural data obtained for the compounds co-doped with Ca and Ti ions testify stability of the polar rhombohedral state up to the concentration level of 25 %. Co-doping with Ca and Mn ions gradually modifies magnetic structure of the compounds toward weak ferromagnetic one; there is no correlation observed between the type of structural distortion and magnetic structure of the compounds. The Bi1−x Ca x Fe1−x Mn x O3 compounds with x > 0.25 show complex magnetic behavior associated with the coexistence of antiferromagnetic matrix and magnetic clusters. Compounds co-doped with Ca and Ti ions with rhombohedral structure testify nearly three times larger remnant magnetization as compared with that observed for Ca|Mn-doped series, and magnetic state of the compounds with x > 0.1 remains to be homogeneous weak ferromagnetic one up to x ~ 0.3, and above this concentration, magnetic structure is disrupted because of diamagnetic dilution.
KeywordsCoercive Force Remnant Magnetization Chemical Substitution Neutron Powder Diffraction Data Weak Ferromagnetic State
This work was supported by the RSF (Project #15-19-20038).
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Conflict of Interest
The authors declare that they have no conflict of interest.
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