Chemical ordering and magnetic phase transitions in multiferroic –AFeSbO(A-Pb, Sr) solid solutions fabricated by a high-pressure synthesis
Abstract
Ceramic samples of BiFeO3-based perovskite solid solutions with the highly ordered complex perovskites O3(PFS) and O3 (SFS) were obtained using high-pressure synthesis at 4–6 GPa. Mössbauer studies revealed that BiFeO3-SFS compositions are characterized by a larger compositional inhomogeneity as compared to BiFeO3-PFS ones. In line with this result, concentration dependence of the magnetic phase transition temperature for BiFeO3-SFS compositions is close to the dependence for BiFeO3solid solution with disordered perovskite O3(PFN). In contrast to this dependence for BiFeO3-PFS compositions nicely follows the theoretical dependence calculated for the case of the ordered distribution of Fe and non-magnetic Sb ions in the lattice (chemical ordering).
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