中国物理B ›› 2014, Vol. 23 ›› Issue (3): 37501-037501.doi: 10.1088/1674-1056/23/3/037501

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

Ho and Ti co-doped BiFeO3 multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity

谷艳红a, 刘雍a, 姚超b, 马衍伟b, 王雨c, 陈王丽华c, 陈万平a   

  1. a Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    b Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    c Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
  • 收稿日期:2013-08-02 修回日期:2013-09-22 出版日期:2014-03-15 发布日期:2014-03-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2009CB939705) and the National Natural Science Foundation of China (Grant No. J1210061).

Ho and Ti co-doped BiFeO3 multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity

Gu Yan-Hong (谷艳红)a, Liu Yong (刘雍)a, Yao Chao (姚超)b, Ma Yan-Wei (马衍伟)b, Wang Yu (王雨)c, Chan Helen Lai-Wah (陈王丽华)c, Chen Wan-Ping (陈万平)a   

  1. a Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    b Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    c Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
  • Received:2013-08-02 Revised:2013-09-22 Online:2014-03-15 Published:2014-03-15
  • Contact: Chen Wan-Ping E-mail:wpchen@whu.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2009CB939705) and the National Natural Science Foundation of China (Grant No. J1210061).

摘要: Bi0.9Ho0.1Fe0.95O3 and Bi0.9Ho0.1Fe0.9Ti0.05O3 ceramics were prepared and compared to reveal the effects of Ho and Ti codoping in BiFeO3. X-ray diffraction indicated that both ceramics had a high rhombohedral perovskite phase content, and microstructural analyses showed that the grains of the Bi0.9Ho0.1Fe0.9Ti0.05O3 ceramics were much smaller than those of Bi0.9Ho0.1Fe0.95O3. An electrical resistivity of more than 1×1014 Ω·cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2Mr of ~0.485 emu/g were obtained for Bi0.9Ho0.1Fe0.9Ti0.05O3; both were much higher than those of Bi0.9Ho0.1Fe0.95O3. Changes in the defect subsystem of BiFeO3 induced by Fe-deficiency and (Ho,Ti) codoping are proposed as being responsible for the improvement in the properties.

关键词: BiFeO3, multiferroics, magnetism, resistivity

Abstract: Bi0.9Ho0.1Fe0.95O3 and Bi0.9Ho0.1Fe0.9Ti0.05O3 ceramics were prepared and compared to reveal the effects of Ho and Ti codoping in BiFeO3. X-ray diffraction indicated that both ceramics had a high rhombohedral perovskite phase content, and microstructural analyses showed that the grains of the Bi0.9Ho0.1Fe0.9Ti0.05O3 ceramics were much smaller than those of Bi0.9Ho0.1Fe0.95O3. An electrical resistivity of more than 1×1014 Ω·cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2Mr of ~0.485 emu/g were obtained for Bi0.9Ho0.1Fe0.9Ti0.05O3; both were much higher than those of Bi0.9Ho0.1Fe0.95O3. Changes in the defect subsystem of BiFeO3 induced by Fe-deficiency and (Ho,Ti) codoping are proposed as being responsible for the improvement in the properties.

Key words: BiFeO3, multiferroics, magnetism, resistivity

中图分类号:  (Magnetoelectric effects, multiferroics)

  • 75.85.+t
77.80.-e (Ferroelectricity and antiferroelectricity) 72.20.-i (Conductivity phenomena in semiconductors and insulators)