Effect of octahedron tilt on the structure and magnetic properties of bismuth ferrite

• Main Authors: Yang Hong, Jun Li, Han Bai, Zhenjia Song, Ming Wang, Zhongxiang Zhou
• Format: Article
• Language: English
• Published: SpringerOpen 2020-09-01
• Series: Journal of Advanced Ceramics
• Subjects: bismuth ferrite (BiFeO3); magnetism; octahedron tilt; Raman spectrum; electromagnetic characteristics
• Online Access: https://doi.org/10.1007/s40145-020-0398-1

Abstract Multiferroic BiFeO3-based ceramics were synthesized using the rapid liquid-phase sintering method. The rare-earth ion (Sm3+, Gd3+, Y3+) 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 A1 modes, and the microstructure of FeO6 octahedron can be regulated by ion doping. A-site trivalent ion doped ceramics exhibit improved magnetism compared with pure BiFeO3 ceramic, which originated from the suppressed spiral spin structure of Fe ions. The tilt of FeO6 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.