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 [Formula: see text][Formula: see text]O3(PFS) and [Formula: see text][Formula: see text]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 [Formula: see text] for BiFeO3-SFS compositions is close to the [Formula: see text] dependence for BiFeO3solid solution with disordered perovskite [Formula: see text][Formula: see text]O3(PFN). In contrast to this [Formula: see text] dependence for BiFeO3-PFS compositions nicely follows the theoretical [Formula: see text] dependence calculated for the case of the ordered distribution of Fe[Formula: see text] and non-magnetic Sb[Formula: see text] ions in the lattice (chemical ordering).

Keywords

• Multiferroics
• chemical ordering
• magnetic phase transition
• BiFeO3
• high-pressure synthesis