Chemical ordering and magnetic phase transitions in multiferroic BiFeO3–AFe1/2Sb1/2O3(A-Pb, Sr) solid solutions fabricated by a high-pressure synthesis

S. I. Raevskaya; N. M. Olekhnovich; A. V. Pushkarev; Y. V. Radyush; S. P. Kubrin; V. V. Titov; E. A. Artseva; I. P. Raevski; I. N. Zakharchenko; C-C. Chou; M. A. Malitskaya

doi:10.1142/S2010135X21600110

Abstract

Ceramic samples of BiFeO₃-based perovskite solid solutions with the highly ordered complex perovskites

{PbFe}_{1 / 2}

{Sb}_{1 / 2}

O₃(PFS) and

{SrFe}_{1 / 2}

{Sb}_{1 / 2}

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

T_{N}

for BiFeO₃-SFS compositions is close to the

T_{N} (x)

dependence for BiFeO₃solid solution with disordered perovskite

{PbFe}_{1 / 2}

{Nb}_{1 / 2}

O₃(PFN). In contrast to this

T_{N} (x)

dependence for BiFeO₃-PFS compositions nicely follows the theoretical

T_{N} (x)

dependence calculated for the case of the ordered distribution of Fe

^{3 +}

and non-magnetic Sb

^{5 +}

ions in the lattice (chemical ordering).Ceramic samples of BiFeO₃-based perovskite solid solutions with the highly ordered complex perovskites

{PbFe}_{1 / 2}

{Sb}_{1 / 2}