Structural and magnetic properties of LaFeO3-BaTiO3 solid solutions

Abstract

Polycrystalline samples of LaFeO3-BaTiO3 were synthesized to examine the structural and magnetic behavior. X-ray diffraction confirmed that the ceramics had tetragonal symmetry with less tetragonal strain (c/a) than BaTiO3. The magnetic hysteresis measured at room temperature suggested that the magnetic nature deviates from that of the parent LaFeO3, which has antiferromagentic with a G-type spin structure. Improved magnetic behavior of the solid solution compound might be due to the increase in the canting angle of the spin. The presence of oxygen vacancies and fluctuating Fe valence, arising from the substitution of Ba2+ and Ti4+ at the A- and B-sites of the lattice, might contribute to bulk magnetization. The temperature dependent magnetization indicated that magnetization was higher at low temperatures and showed a decreasing trend with increasing temperature to room temperature. The magnetic transition temperature of these samples was 665 K and 743 K for the mixed system and LaFeO3, respectively. © 2009 Journal of Magnetics.