中国物理B ›› 2016, Vol. 25 ›› Issue (9): 97801-097801.doi: 10.1088/1674-1056/25/9/097801

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effects of (La, Sr) co-doping on electrical conduction and magnetic properties of BiFeO3 nanoparticles

Li Liu(刘莉), Shouyu Wang(王守宇), Zi Yin(殷子), Weifang Liu(刘卫芳), Xunling Xu(徐训岭), Chuang Zhang(张闯), Xiu Li(李秀), Jiabin Yang(杨佳斌)   

  1. 1. College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China;
    2. Department of Applied Physics, Institute of Advanced Materials Physics, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Faculty of Science, Tianjin University, Tianjin 300072, China
  • 收稿日期:2016-01-14 修回日期:2016-05-25 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: Shouyu Wang E-mail:shouyu.wang@yahoo.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104202 and 51572193).

Effects of (La, Sr) co-doping on electrical conduction and magnetic properties of BiFeO3 nanoparticles

Li Liu(刘莉)1, Shouyu Wang(王守宇)1, Zi Yin(殷子)1, Weifang Liu(刘卫芳)2, Xunling Xu(徐训岭)2, Chuang Zhang(张闯)1, Xiu Li(李秀)1, Jiabin Yang(杨佳斌)1   

  1. 1. College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China;
    2. Department of Applied Physics, Institute of Advanced Materials Physics, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Faculty of Science, Tianjin University, Tianjin 300072, China
  • Received:2016-01-14 Revised:2016-05-25 Online:2016-09-05 Published:2016-09-05
  • Contact: Shouyu Wang E-mail:shouyu.wang@yahoo.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104202 and 51572193).

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摘要： Multiferroic material as a photovoltaic material has gained considerable attention in recent years. Nanoparticles (NPs) La0.1Bi0.9-xSrxFeOy (LBSF, x=0, 0.2, 0.4) with dopant Sr2+ ions were synthesized by the sol-gel method. A systematic change in the crystal structure from rhombohedral to tetragonal upon increasing Sr doping was observed. There is an obvious change in the particle size from 180 nm to 50 nm with increasing Sr substitution into LBFO. It was found that Sr doping effectively narrows the band gap from ～2.08 eV to ～1.94 eV, while it leads to an apparent enhancement in the electrical conductivity of LBSF NPs, making a transition from insulator to semiconductor. This suggests an effective way to modulate the conductivity of BiFeO3-based multiferroic materials with pure phase by co-doping with La and Sr at the A sites of BiFeO3.

关键词: BiFeO3, doping, conductivity, magnetic properties

Abstract: Multiferroic material as a photovoltaic material has gained considerable attention in recent years. Nanoparticles (NPs) La0.1Bi0.9-xSrxFeOy (LBSF, x=0, 0.2, 0.4) with dopant Sr2+ ions were synthesized by the sol-gel method. A systematic change in the crystal structure from rhombohedral to tetragonal upon increasing Sr doping was observed. There is an obvious change in the particle size from 180 nm to 50 nm with increasing Sr substitution into LBFO. It was found that Sr doping effectively narrows the band gap from ～2.08 eV to ～1.94 eV, while it leads to an apparent enhancement in the electrical conductivity of LBSF NPs, making a transition from insulator to semiconductor. This suggests an effective way to modulate the conductivity of BiFeO3-based multiferroic materials with pure phase by co-doping with La and Sr at the A sites of BiFeO3.

Key words: BiFeO3, doping, conductivity, magnetic properties

中图分类号:  (Nanocrystals, nanoparticles, and nanoclusters)

  • 78.67.Bf
77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials) 75.75.-c (Magnetic properties of nanostructures)