Effect of Ba Substitution on the Structural and Magnetic Properties of BiFeO<sub>3</sub>

Abstract

Bi 1−x Ba x FeO 3 (0 ≤ x ≤ 0.3) nanopowders were synthesized using sol-gel technique. The structural and magnetic properties were investigated using X-ray diffraction, SEM and VSM. As Ba 2+ doping concentration was increased, the structure of the samples changed from rhombohedral to tetragonal or monoclinic. The structural change might be an important factor for achieving the ferroelectric properties in this material. The lattice parameters were observed to increase with increase in Ba 2+ concentration. All the M-H loops showed the ferromagnetic behavior. Magnetization was observed to enhance with increase in Ba concentration. The enhancement in the magnetization due to Ba 2+ doping may be due to the replacement of Bi 3+ ions by Ba 2+ which might have resulted in the suppression of spiral spin structure.

Effect of Bi3+ Ion Substitution on Magnetic Properties of Cobalt Nano Ferrites Prepared by Sol-Gel Combustion Method

“…This is due to the smaller ionic radiuses of Fe 3+ (0.64Å) ions are partially replaced by the greater ionic radius of Bi 3+ (1.31Å) ions at octahedral position (B-site). The calculated crystallite size was found to be as 21 (±5) nm and these results were well agreement with literature [21] [22]. The lattice constant of all these ferrites were evaluated by using Equation (2).…”