Enhancement of ferromagnetic and dielectric properties in lanthanum doped BiFeO3 by hydrothermal synthesis

Authors

Yi Du, University of WollongongFollow
Zhenxiang Cheng, University of WollongongFollow
Mahboobeh Shahbazi-ManshadiFollow
Edward W. Collings, Ohio State University, Columbus, USA
S X. Dou, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow

RIS ID

31888

Publication Details

Du, Y, Cheng, Z, Shahbazi-Manshadi, M, Collings, E, Dou, SX & Wang, X (2010), Enhancement of ferromagnetic and dielectric properties in lanthanum doped BiFeO3 by hydrothermal synthesis, Journal of Alloys and Compounds, 490(1-2), pp. 637-641.

Abstract

Multiferroic Bi_1−xLa_xFeO₃ (x = 0.0, 0.1, 0.2, and 0.3) micro-particles were successfully synthesized by a hydrothermal technique. All the samples were phase pure crystallizing in a perovskite structure with a space group of R3c. XRD refinement revealed that the lattice parameters increased along with increase of La content, while the Fe–O octahedra became more distorted. It was found that the morphologies of as-obtained micron-sized particles turned from spheroidal to octahedral according to different doping levels. The dielectric constant of Bi_1−xLa_xFeO₃ sample increased after La doping, and reached the largest value for the sample of x = 0.2, both in low and high frequency range at room temperature. All the as-prepared samples exhibited magnetic moments starting above room temperature. It was found that the magnetic moment was significantly enhanced from 0.264 emu/g of BiFeO₃ to 0.658 emu/g of Bi_0.9La_0.1FeO₃ in a field of 3 T at 77 K. Both enhancements of ferromagnetic and dielectric properties possibly attribute to the changes of lattice parameters and Fe–O bond lengths caused by lanthanum substitution.