Ho and Ti co-doped BiFeO_3 multiferroic ceramics with enhanced magnetization and ultrahigh electrical resistivity  

作　　者：谷艳红 刘雍 姚超 马衍伟 王雨 陈王丽华 陈万平 

机构地区：[1]Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University [2]Institute of Electrical Engineering, Chinese Academy of Sciences [3]Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University

出　　处：《Chinese Physics B》2014年第3期518-521,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2009CB939705);the National Natural Science Foundation of China(Grant No.J1210061)

摘　　要：Bio.9HOo.lFeo.9503 and Bio.9HOo.lFeo.9Tio.0503 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 Bio.9HOo.lFeo.9Tio.0503 ceramics were much smaller than those of Bio.9HOo.lFeo.9503. An electrical resistivity of more than 1 × 1014.cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2Mr of 0.485 emu/g were obtained for Bi0.9HO0.1Fe0.9Ti0.0503; both were much higher than those of Bio.9Hoo.1Feo.9503. 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.Bio.9HOo.lFeo.9503 and Bio.9HOo.lFeo.9Tio.0503 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 Bio.9HOo.lFeo.9Tio.0503 ceramics were much smaller than those of Bio.9HOo.lFeo.9503. An electrical resistivity of more than 1 × 1014.cm at room temperature, and a magnetic hysteresis loop with a remnant magnetization 2Mr of 0.485 emu/g were obtained for Bi0.9HO0.1Fe0.9Ti0.0503; both were much higher than those of Bio.9Hoo.1Feo.9503. 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 

分 类 号：O482.5[理学—固体物理]