Multiferroic and optical studies on the effects of Ba2+ ions in BiFeO3 nanoparticles

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• 作者：Manpreet Kaur ; K. L. Yadav ; Poonam Uniyal
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：27
• 期：5
• 页码：4475-4482
• 全文大小：2,490 KB
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• 作者单位：Manpreet Kaur (1)
  K. L. Yadav (2)
  Poonam Uniyal (1)
  
  1. School of Physics and Materials Science, Thapar University, Patiala, Punjab, 147 004, India
  2. Smart Material Research Laboratory, Department of Physics, Indian Institute of Technology, Roorkee, 247667, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1573-482X

文摘

Single phase Ba2+ ions doped BiFeO₃ nanoparticles have been successfully synthesized with varied concentration (0.0 ≤ x ≤ 0.2) using the auto combustion method. The structural properties of Bi_1−xBa_xFeO₃ (x-0.0, 0.1 and 0.2) nanoparticles reveal the formation of highly crystalline rhombohedrally distorted perovskites without undergoing any structural phase transformation analyzed via Rietveld refinement. The Pauling’s equation confirmed that Ba2+ ions doped BiFeO₃ ceramics have much more negative enthalpy of formation (ΔH _f ) than undoped BiFeO₃. A reduction of particle size has been observed up to x = 0.1 and then after increases, whereas the band gap shows a reverse trend. Magnetic and ferroelectric transition temperatures are found to be slightly shifted towards the lower temperature up to x = 0.1 and then higher temperature side which could be attributed to the particle size effect. Ba2+ doped BiFeO₃ ceramic with concentration x = 0.2 exhibit larger magnetization as compared to others at room temperature, but these magnetization curves were not saturated. Remnant polarization is found to decrease from 7.693 to 5.141 µC/cm2 along with the doping of Ba2+ ions. The on-site d-to-d crystal field excitations of Fe3+ ions associated with 6A_1g–^{4T_1g or 6A_1g–4T_2g electronic energy levels, Fe₁3d–Fe₂3d inter-site electron transfer and inter-atomic O 2p–Fe 3d electronic energy levels are observed by the means of absorption spectroscopy.}