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Tuning of dielectric and ferroelectric properties in single phase BiFeO3 ceramics with controlled Fe/Fe ratio |
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| Authors: | Shanming Ke Peng Lin Xierong Zeng Haitao Huang L.M. Zhou Y.-W. Mai |
| Affiliation: | 1. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;2. Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China;3. Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;4. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;5. Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering J07, University of Sydney, Sydney, NSW 2006, Australia |
| Abstract: | Single phase multiferroic BiFeO3 (BFO) ceramics were synthesized with controllable amount of Fe2+ and oxygen vacancies in a very wide concentration range. Double ferroelectric hysteresis loops are observed in fresh BFO ceramics at room temperature without any aging processes. Detailed study shows that this is due to the defect dipoles which have preferential orientations antiparallel to the direction of spontaneous polarization, providing a driving force for domain back-switching. The dielectric constant of BFO could be enormously enhanced by 100 times by increasing the Fe2+ content, employing a polaronic relaxation process. |
| Keywords: | BFO Oxygen vacancy Antiferroelectric-like P&ndash E loops Polaronic relaxation |
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