La和Nb共掺提高BiFeO<sub>3</sub>的磁学性能

doi:10.11896/j.issn.1005-023X.2018.02.003

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Abstract

In the present work, a series of Bi_1-_xLa_xFe_0.99Nb_0.01O₃ (x≤0.25) nanopowders were prepared by sol-gel method, in order to investigate the crystalline structure, grain size and magnetic properties of La and Nb co-doped BiFeO₃ nanopowders. All samples are consistent of an R3c rhombohedral structure with decreasing Fe-O-Fe bond angles as the La concentration increases, according to XRD and Rietveld refinement. The XPS data demonstrate that La and Nb co-doping do not change the ratio of Fe ³⁺ to Fe ²⁺ in doped BFO system. The remnant magnetization was found to depend markedly on La doping amount (x). It is shown that the La-doping dominates the anti-rotation of the FeO₆ octahedral, while the low doping of Nb results in the refinement of the grains. Both mechanisms would give rise to the magnetization enhancement in bismuth ferrite.

Key words： bismuth ferrite doping magnetic properties lattice distortion

Published: 25 January 2018 Online: 2018-01-25

CLC number:

O76

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	Articles by authors
	Shilie DENG
	Huimin XIAN
	Xi CHEN
	Lingyun TANG
	Jiang ZHANG
	Zhongquan MAO

Cite this article:

Shilie DENG,Huimin XIAN,Xi CHEN, et al. Enhanced Magnetic Properties of Bismuth Ferrite by La and Nb Co-doping[J]. Materials Reports, 2018, 32(2): 176-179.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.02.003 OR https://www.mater-rep.com/EN/Y2018/V32/I2/176

(a) The X-ray diffraction patterns and (b) the local amplified XRD patterns of Bi_1-_xLa_xFe_0.99Nb_0.01O₃

The refined results of BFO and B

i 1 - x

La_xFe_0.99Nb_0.01O₃

(a) The lattice parameters and (b) the Fe-O-Fe bond angle as a function of doping amount x of Bi_1-_xLa_xFe_0.99Nb_0.01O₃

Raman spectra of Bi_1-_xLa_xFe_0.99Nb_0.01O₃ samples

SEM images of BLFNO samples

Fe2p 3/2 XPS fitting peaks of BFO and Bi_1-_xLa_xFe_0.99Nb_0.01O₃ samples

(a) Hysteresis loops and (b) the remnant magnetizations of BLFNO (the data of BiFe_1-_yNb_yO₃ are from Ref.[10])

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