Effect of octahedron tilt on the structure and magnetic properties of bismuth ferrite
Yang Hong, Jun Li, Han Bai, Zhenjia Song, Ming Wang, Zhongxiang Zhou
Abstract
Abstract Multiferroic BiFeO 3 -based ceramics were synthesized using the rapid liquid-phase sintering method. The rare-earth ion (Sm 3+ , Gd 3+ , Y 3+ ) doping causes structural distortion without changing the intrinsic rhombohedral perovskite structure. Raman analysis shows that the effect of doping on E modes is greater than A 1 modes, and the microstructure of FeO 6 octahedron can be regulated by ion doping. A-site trivalent ion doped ceramics exhibit improved magnetism compared with pure BiFeO 3 ceramic, which originated from the suppressed spiral spin structure of Fe ions. The tilt of FeO 6 octahedron as a typical structure instability causes the anomalous change of the imaginary part of permittivity at high frequency, and doped ceramics exhibit natural resonance around 16–17 GHz.