scholarly journals Synergistic Effects of Ca2+ and High-Valence Nb5+ co-Doping on the Structural, Optical and Magnetic Properties of BiFeO3

2021 ◽  
Author(s):  
Huimin Xian ◽  
Lingyun Tang ◽  
Zhongquan Mao ◽  
Jiang Zhang ◽  
Xi Chen
Keyword(s):  
Magnetic Properties ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Doping Amount ◽  
Co Doping ◽  
As Doping ◽  
Type Semiconductor ◽  
Ca Ions ◽  
Optical And Magnetic Properties ◽  
Band Spectra

Abstract The structural, optical and magnetic properties of BiFeO3, BiFe0.99Nb0.01O3 and Bi1 − xCaxFe0.99Nb0.01O3 (BCFNO, 0 ≤ x ≤ 0.25) nanoparticles synthesized via sol-gel method are investigated. It has been found that a phase transition from the rhombohedral R3c structure (x ≤ 0.10) to the ideal cubic perovskite structure (x = 0.25) which can be attributed to Ca2+ doping. Increasing Ca2+ dopants results in the increase of oxygen vacancies. As doping amount x increase, the band gap of BCFNO decreases and the valence band spectra indicates that it’s a p-type semiconductor, which indicates their favorable potential in photocatalytic applications. The remnant magnetization Mr of BCFNO reaches a maximum value (0.146 emu/g about 15 times compared with pure BFO) at x = 0.10. This enhancement of magneitic properties in BCFNO can be ascribed to the synergistic effect of A and B site ions co-doping. Higher valance Nb doping cause the size effect and the magnetic polarons bounded to the impurities by Ca ions.

Effects of Sm and Mn co-doping on structural, optical and magnetic properties of BiFeO3 films prepared by a sol–gel technique

2015 ◽  
Vol 144 ◽  
pp. 93-96 ◽  
Author(s):  
Wenliang Zhou ◽  
Hongmei Deng ◽  
Huiyi Cao ◽  
Jun He ◽  
Jian Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Co Doping ◽  
Gel Technique ◽  
Optical And Magnetic Properties

scholarly journals The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4061
Author(s):  
Yongtao Li ◽  
Liqing Liu ◽  
Dehao Wang ◽  
Hongguang Zhang ◽  
Xuemin He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Metal Ion ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray ◽  
Co Doping ◽  
Magnetic Ions ◽  
X Ray Absorption ◽  
Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

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