Effect of La and Sr co-doping on electric and magnetic properties of multiferroic La0.1Bi0.9−xSrxFeO(3−x/2) ceramics

Abstract

[Formula: see text] ceramics were synthesized by solid-state reaction method, and their magnetic properties and conductive characteristics were investigated and discussed. It is found that La-doped [Formula: see text] ceramic without [Formula: see text] doping is a rhombohedrally distorted perovskite structure, and with the increase of the [Formula: see text] concentration, the phase transits gradually from rhombohedral to pseudo cubic symmetry. Electrical and magnetic properties show strong dependence on [Formula: see text] dopant level. The measurement demonstrates that [Formula: see text] with 30% [Formula: see text] dopant exhibits the lowest values of the leakage current, dielectric constant [Formula: see text] and dielectric loss [Formula: see text]. And the highest value of saturation magnetization of about 4.5 emu/g is observed in 60% Sr-doped [Formula: see text]. An abnormal enhancement of the conductivity was observed in [Formula: see text] ceramics with [Formula: see text] = 0.60 and 0.70, and their magnitude of conductivity is nearly six orders larger than that of pure [Formula: see text].