Structure analysis, ferroelectric and ferromagnetic properties in nanostructured Bi2O3 -Fe2O3 -PbTiO3 for magnetoelectric applications

The ternary 0.52Bi(2)O(3) - 0.18Fe(2)O(3) - 0.30PbTiO(3) (BFPT) system was prepared by mechanosynthesis in a highenergy planetary mill. The mixed powder was milled for 1, 2, 5, and 10 h. After 5 h of milling, the partially crystalline phase was achieved, as investigated by the XRD analysis. HRTEM verified the nanoparticle formation, and the mean size of the particles is estimated to be similar to 2.95 nm. Dielectric permittivity, loss tangent, electric modulus, and ac conductivity were measured for the milled system for 5 h as a function of frequency and temperature. The nanostructured BFPT sample shows a high dielectric permittivity (epsilon' similar to 1388 at 500 Hz) obtained at T-c similar to 633 K (Curie temperature), which corresponds to the structural phase transition. The experimental results of sigma(ac) are acceptable with the CBH model. The measurements of the P-E hysteresis loop illustrated recoverable energy density (W-rec=4.33 mJ/cm(3)) and energy storage efficiency (eta=60.56%) at room temperature. The M-H data represent remnant magnetization (M-r) of 12.41 x 10(-3) emu/g and coercive field (H-c) of 497.23 Oe. These remarks suggest that the nanostructured BFPT sample might be a promising option for magnetoelectric applications.

Automated summary

The nanostructured BFPT sample synthesized by mechanochemical method exhibits high dielectric permittivity at high temperature and recoverable energy density and energy storage efficiency at room temperature. These samples also show potential for magnetoelectric device applications.