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

doi:10.1088/1674-1056/23/3/037501

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

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

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/Abstract

摘要： Bi_0.9Ho_0.1Fe_0.95O₃ and Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃ 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 Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃ ceramics were much smaller than those of Bi_0.9Ho_0.1Fe_0.95O₃. An electrical resistivity of more than 1×10¹⁴ Ω·cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2M_r of ～0.485 emu/g were obtained for Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃; both were much higher than those of Bi_0.9Ho_0.1Fe_0.95O₃. 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: Bi_0.9Ho_0.1Fe_0.95O₃ and Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃ 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 Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃ ceramics were much smaller than those of Bi_0.9Ho_0.1Fe_0.95O₃. An electrical resistivity of more than 1×10¹⁴ Ω·cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2M_r of ～0.485 emu/g were obtained for Bi_0.9Ho_0.1Fe_0.9Ti_0.05O₃; both were much higher than those of Bi_0.9Ho_0.1Fe_0.95O₃. 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)

谷艳红, 刘雍, 姚超, 马衍伟, 王雨, 陈王丽华, 陈万平. Ho and Ti co-doped BiFeO₃ multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity[J]. 中国物理B, 2014, 23(3): 37501-037501.

Gu Yan-Hong (谷艳红), Liu Yong (刘雍), Yao Chao (姚超), Ma Yan-Wei (马衍伟), Wang Yu (王雨), Chan Helen Lai-Wah (陈王丽华), Chen Wan-Ping (陈万平). Ho and Ti co-doped BiFeO₃ multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity[J]. Chin. Phys. B, 2014, 23(3): 37501-037501.

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

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

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