| During the last few decades,so much focus is given to the perovskite bismuth ferrite BiFe O3?BFO?which displays G-type antiferromagnetism and ferroelectricity.But there are some inherent disadvantages of pure BFO such as antiferromagnetic nature and high conductivity due to its charge defects.Various efforts have been de voted to solving the drawbacks such as rare-earth element or/and transition metal doping.The polycrystalline anoparticles of Mn doped?Dy doped??Eu,Mn?co-doped and?Dy,Mn?co-doped BFO were prepared by sol-gel route.The main contents of this paper listed as followed:1?BFO and BFMO were prepared by sol-gel method.XRD results show that doping could result in a transition of crystal structure.The Eg decreased indicate the enhancement of the half-metallic property.With the increase of concentration of dopant,the Mr of BFM2 do not to rise,it may be the optimal doping amount of Mn between 2.5% and 5%.2?The polycrystalline nanoparticles of BFO and BEFM were prepared by sol-gel route.XRD and Rietveld refinement analysis implied that the samples are diphasic of R3 c and PM-3M by doping.By EDS analysis,the actual doping concentration agree with the theoretical value approximately.The enhanced ferroelectric-magnetic properties BEFM samples might be attributed to dopants,which induced the change of electronic conduction and structural distortion.3?Bi1-xDyxFe1-yMnyO3?x = 0.025,0.05,y = 0,0.05?nanoparticles were prepared by sol-gel route.The Dy and Mn doped BFO nanoparticles show superior optical,electric and magnetic properties.The microstructure distortion and increased superposition of electronic wave functions can cause the Eg decreased after doping.The increase of Fe3+ ions concentrations indicating the formation of oxygen vacancies can be greatly suppressed since doping,which leading to the lower leakage current density.The Mr and coercive field Hc are increased with doping. |
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