Structural and Ferromagnetic Properties of Ho-Doped BiFeO₃ Films

Abstract:

In order to improve the structural and ferromagnetic property of BiFeO₃, the effects of Ho³⁺ doping is systematically investigated. Pure BiFeO₃ and Ho-doped BiFeO₃ thin films are fabricated by sol-gel method, and the phase structure, morphology, crystalline structure, ferromagnetic are characterized by XRD, SEM, Raman spectra and VSM, respectively. The XRD patterns of the samples indicate that all the compounds crystallize in rhombohedral distorted perovskite structure with space group R₃c and the Ho substitution can suppress the intrinsic formation of the miscellaneous phase. The SEM proves that along with the increasing of Ho concentration, the surface roughness of BiFeO₃ is decreased due to the reduction of defects in the preparation. From the Raman spectroscopy, it is found that the peak intensity of 8 modes in Bi_1-xHo_xFeO₃ are increased and the modes shift to higher wave number. Besides, the VSM results show that the ferromagnetic of the samples is enhanced with increasing of Ho concentration. When x=0.1, Ms is improved to be 4.8emu/g. The results can prove that the Ho³⁺ doping can reduce the volatilization of Bi³⁺, decrease the concentration of oxygen vacancies and improve the room-temperature ferromagnetic of BiFeO_3.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 996-1000
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.996
• Online since: January 2017
• Authors: Ning An, Hai Tao Zhang*, Cheng Zhi Liu, Cun Bo Fan, Xue Dong, Qing Li Song, Guan Yu Wen
• Keywords: BiFeO₃, Ferromagnetic, Ho-Doped, Sol-Gel Method

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