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.
Highlights
Multiferroic materials are one of the most studied materials in recent years due to their unique properties, which exhibit more than two ferroic orders (such as ferroelectricity (TC), ferromagnetism (TN), ferroelastic, etc.)
In order to evaluate the phase formation and crystallinity of the samples, an XRD study was performed, and the effect of the substitution of doped ions for Bi3+ ion on the structure of BiFeO3 was investigated by Rietveld refinement, which was performed by using the GSAS program
The results indicate that the rare earth ion doping can effectively improve the magnetic properties of BFO at room
Summary
Multiferroic materials are one of the most studied materials in recent years due to their unique properties, which exhibit more than two ferroic orders (such as ferroelectricity (TC), ferromagnetism (TN), ferroelastic, etc.). Jena et al [18] found that the spincoated Y-doped BFO film exhibits low field saturation magnetization by suppressing the spiral spin modulated periodicity due to FeO6 octahedral distortion.
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