Abstract
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.
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This work was supported by the RSF (Project #15-19-20038).
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Karpinsky, D.V., Troyanchuk, I.O., Bushinsky, M.V. et al. Crystal structure and magnetic properties of Bi1−x Ca x Fe1−x Mn(Ti) x O3 ceramics across the phase boundary. J Mater Sci 51, 10506–10514 (2016). https://doi.org/10.1007/s10853-016-0271-3
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DOI: https://doi.org/10.1007/s10853-016-0271-3