期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 603, 期 -, 页码 224-229出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.03.072
关键词
BiFeO3 ceramic; Doping; Electrical conductivity; Oxygen vacancy; Electrical impedance; Threshold switching
资金
- Research Grant Council of Hong Kong [HKU702409P]
- National Natural Science Foundation of China [11004148, 11104202]
- Natural Science Foundation of Tianjin [11JCZDJC21800, 11JCYBJC02700]
- Research Foundation of Tianjin Education Council [20090308]
- SRF for ROCS, SEM
The structural and conductive characteristics of La0.2Bi0.8Fe1 xMgxO3 (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) ceramics synthesized by a modified rapid sintering process are investigated and discussed. There is no any impure phase even in La0.2Bi0.8Fe0.95Mg0.05O3 ceramic, meanwhile, all samples show rhombohedral structure and the SEM micrograph shows that the ceramics are getting compact with the increase of Mg substitution. The AC impedance measurement reveals an obvious trend of transition from insulator to semiconductor upon doping Mg. When x = 0.01-0.04, a threshold switching effect can be observed and the threshold voltage shows strong dependence on the Mg dopant level. This work suggests an effective method to modulate the conductivity of BiFeO3-based multiferroic materials with purephase structure by codoping with La and Mg at Bi and Fe site respectively. (C) 2014 Elsevier B.V. All rights reserved.
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