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Preparation and Characterization of Doped BiFeO3 Nanocrystals

Author: LiPeng
Tutor: LiXingZuo
School: Nanjing University of Posts and Telecommunications
Course: Optics
Keywords: BiFeO3 nanocrystalline Sol - gel Antiferromagnetic Doping Complex
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 48
Quote: 0
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Abstract


The multiferroic material was very important advanced functional materials, while the the perovskite structure BiFeO 3 < / sub > is one of a small number of single-phase multiferroic materials at room temperature antiferromagnetic and ferroelectric cause of great concern because of its room temperature was antiferromagnetic and ferroelectric ordering . BiFeO 3 are still some problems in the preparation of volatilization of Bi ions and oxygen vacancy generation causes difficult to prepare a pure phase the BiFeO 3 < / sub > Second BiFeO 3 special G-type antiferromagnetic structure , macroscopic size BiFeO 3 showed weak antiferromagnetic at room temperature , a serious impediment to its the development of practical applications . Firstly, sol-gel method BiFeO 3 nanocrystals prepared by two different complexes of PVA and tartaric acid . By optimizing the preparation process of the two complexes , in a low temperature of 400 ° C with tartaric acid as complex , has been a pure phase BiFeO 3 nanocrystals . Analyzed using X - ray diffraction (XRD) and scanning electron microscopy (SEM) measurements sample structure and morphology of sol - gel process and different complex 3 nanocrystalline BiFeO formation and crystal structure . The paper also highlights A bit of rare earth elements Eu and B -bit magnetic transition metal elements Co doping BiFeO 3 nanocrystalline structure and magnetic changes , and explore the reasons for the enhancement of this magnetic . Prepared by the sol - gel Eu, Co co-doped Bi ( 0.95 E u 0.05 < / sub > Fe 0.95 < / > Co 0.05 O 3 nanocrystals, XRD, SEM, and Raman scattering spectroscopy ( Raman scattering ) , X - ray absorption spectroscopy (XAS) , X - ray absorption fine structure (XAFS ) characterization results indicate that , Eu , Co codoped BiFeO 3 nanocrystals remains pure phase, however, the crystal lattice of the sample significantly distorted ; vibrating sample magnetometer ( the VSM ) of the sample the magnetic measurement results showed that: at room temperature, due to the incorporation of Eu, Co ions , the magnetic properties of the sample to obtain significantly enhanced this is mainly attributed to the incorporation of Eu, Co lead a BiFeO 3 nano crystal lattice distortions as well as the formation of a new coupling of the magnetic moments for this study , we have been the article are hired [* ] .

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