Induced modi fi cations in the properties of Sr doped BiFeO3 multiferr oics

Multiferroics exhibit unique combination of ferroic properties, simultaneously. For instance, in BiFeO₃, magnetic and electric properties co-exist. In this work, BiFeO₃ and Sr-doped BiFeO₃ samples with general formula, Bi_1?xSr_xFeO₃ (x=0.00, 0.05, 0.10, 0.20, and 0.30) were synthesized by sol–gel auto-combustion technique, in order to investigate these ferroic properties. The samples were confirmed to have perovskite type rhombohedral structure, characteristic of BiFeO₃. A dilute phase of Bi₂Fe₄O₉ was also found in all the Sr-doped samples. The micrographs of the palletized samples revealed that minutely doped Sr might not have any effect on the morphology of the samples. Frequency dependent dielectric measurements were carried out at room temperature for all the samples from 100 Hz to 1 MHz. The dielectric constant of un-doped sample at low frequency was 52 which decreased with increasing Sr doping. An enhancement of magnetic properties was observed with increasing the Sr contents. Pure BiFeO₃ material was observed to have the least value of remanent magnetization. As the Sr²⁺ ions were doped in BiFeO₃, its magnetization and remanence were increased to 0.867 emu/g and 0.175 emu/g, respectively, at x=0.30.